I have never had a problem yet with this car 158,000 miles, previous owner put new distributor plugs and wires in before I had it, only around 15,000 miles. In neutral or clutch pressed the engine revs no problem, sometimes stutters for a millisecond but is fine overall. But when it is in any gear when I try to accelerate if the rpms are below around 2,200 it just hates it. It started yesterday but only happened once through out all my driving. Today it drove to work fine. Coming home from work it bogged hard when I shifted to 4th at around 40mph and tried to hold the speed. But then it jumped back and was fine. Then about 5 minutes later it happened constantly below 2.2k I can easily recreate the problem, I unplugged the o2 sensor and went for a drive and it didnt solve anything but it almost died this time, wouldn't go anywhere if it was below 2.2k so I had to ride the clutch and shift later than I usually would just to get it home. What could be my issue?

 

Hmmm...I'm not sure why you would unplug the o2 sensor, but maybe you can explain why you tried that, I would presume that puts it into a limp home mode, not something that would help in any case, but again maybe you can explain.

But with that said, I would test spark and fuel pressure. For spark, I would pull a spark plug and then have someone rev the car. You said it stutters a little even with no load on it, so you can observe if the spark it when that happens as someone revs it. If that is the case, then perhaps you have a timing issue going on, have that checked.

If possible, get a fuel pressure gauge and test the pressure while at idle to see if it fluctuates while under load, that might be a fuel pump issue.

Good luck.

 

I was doing some reading on cb7 tuner and a couple.guys mentioned that the o2 sensor could cause something like this when at operating temp. Another thing no CEL. But next I'm going to pull the plugs, change the fuel filter, check for vac leak, and test fuel pressure. I may end up cleaning the egr iacv pitv , and I'm going to see if I have coolant too because I know those utilize coolant to work

 

Update: the car won't start at all now that it's cold again. Jumps a couple times but doesn't give any promising signs of wanting to really start.

 

Check spark and fuel. When cranking , do you smell fuel? If not, that's my guess, fuel pump or relay. If you do smell fuel, then my guess is spark, pull a plug and see if it's sparking at all at this point, that would lead to distributor issue. If you think it's spark, pull the cap and rotor off to inspect if maybe something simply like it fell apart in there or is corroded.

 

When I get off work today I'm going to pull all the valves, check for spark, and check for fuel. I'll see what I can figure out and update you guys. I doubt that it's a distributor issue although because the distributor is essentially new. Along with the wires, but plugs could be bad or just a bad distributor

 

Update: got home and got it to start playing with the gas slightly. Didn't Stutter at all. Shut it down gave it 10 min. Went to start it and fired right up no problem. Went for a test drive and no problems at all. My guess was clogged fuel line maybe.

 

Hmmm...if it was clogged, I would run cleaner through it a few times. But, thinking about it, it could have been water in the line or your tank, that would also make a car stutter. For that, put in some Heet in it to help with that:
https://www.autozone.com/fuel-and-en...E&gclsrc=aw.ds

 

Problem returned today, I had to adjust the ficv to get it to start, ran fine after that, but once it got to operating temp it returned hard. I cleaned all the idle valves, the egr, checked the plugs and wires, have fuel pressure, all the injectors are working. But now it's at idle too if I give it gas, especially to the floor it will die unless I'm really light on it. Backfired when I was driving and died a couple of times.

 

You said you "checked" the wires, cap rotor, spark plugs. How? Do you mean you simply looked at them? Or that you pulled one, and actually checked the spark? because inspection is nice, but it is not sufficient for testing. The reason I am harping on this is because you are getting backfires, which is unburnt fuel exploding in the exhaust. That tells me you are getting fuel, but something in the ignition is not right. So, go back and actually check the spark, and chase it back to the wires and the cap/rotor and the distributor to make sure all the voltages are correct.

In addition, I would also check the timing, as this sounds a bit like that as well.
Here's how:

I think at idle the timing should be somewhere between 14-16 degrees.

 

The stutter (hesitation, stumble, etc.) may be due to clogged EGR ports.

 

Here's another link related to cleaning out the EGR ports: EGR port cleaning

 

I cleaned the egr valve, but I didn't clean these ports, I will definitely do this when I get the chance. And to address spark and back fire, it doesn't really backfire unless it dies, it's more of a misfire. The cap and rotor had red dust covering them, I replaced both and the gasket. The wires were replaced by the previous owner along with the distributor same with the plugs. I pulled the plus and inspected each one and verified no cracks and that they were in good condition, before this I pulled each wire off while the engine was running and it was equal change for each plug. Egr ports, igniter/icm, and timing are going to be my next steps

 

Update: I just purchased a distributor and when it arrives then I can tackle all dizzy components along with base timing. I will post an update when I do this, I will also clean the egr ports at the same time

 

DID YOU EVER FIGURE THIS OUT... PLZ HELP IM HAVING THE SAME ISSUE..ryankelly7.29@gmail.com

 

I too am having this issue and would like to know if it was fixed. I'm not super mechanic savvy and will try what have been suggested.