I just cleaned out my egr ports in an effort to clear the code 12 i was getting (success!! Thank you to Mikep's step-by-step).
Now i have a 43 and a 1 popping up, they intermittently appeared before but now they are pretty constant once the car's heated up. Additionally, since cleaning the egr ports i've had a recurring problem of the jar driving oddly, not sure how to describe it other that it feels like the car is pulsing when i'm driving at freeway speeds (is this what a loping idle is?).

Question 1 - Do you think this pulsing is related to the 43/1 codes?
Question 2 - Do i run the risk of damaging my car/killing myself when my car explodes by continuing to drive it with this pulse? (finals are next week so i'm looking at driving it at least through then since i've got no time to fix it until school's out)
Question 3 - Should i start with replacing the O2 sensor (since that seems easiest) and then move on to hunting down the 43?
Question 4 - I've read that the 43 can be aggravating to sort out... what's the most likely culprit? The fuel pump? Some sort of vacuum issue?
Question 5 - I previously posted a question regarding a cut egr vacuum line, is there any chance that is related to my driveability issues?

 

If you used carb cleaner before it could if messed it up but take it out n clean n. might work

 

Those codes are for the oxygen sensor. Replace it with a Denso oxygen sensor and you should be good to go, especially since they were coming up before you did intake work, which probably used its last life up. Normally $40 bucks at rockauto.

Just in case you have an exhaust leak that contributed to your oxygen sensor failure, you should test the exhaust for an exhaust leak before replacing the sensor.

 

Thanks Holmesnmanny, do you think an exhaust leak or the O2 sensor being faulty could be making the car pulse like it does?

 

Fix the problem you KNOW need to be fixed first and then see what happens. It its possible that other problems may clear up.


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Your issue is most likely just that your oxygen sensor is bad. Lots of times they go bad without throwing a code so since yours is throwing a code, you should first replace it. Then call around and try to find a shop that has a smoke tester. They will have a machine send smoke through the tailpipe and it will come out of the exhaust if there is a leak.

You can also seafoam your car to test for a leak in the exhaust. The car will smoke so if there's a leak it will come out of the exhaust through the leaking spot. It's very important to do it correctly and not to allow the car to stall when doing it or you can damage your engine. If you've never seafoamed your car it might be best to just find a shop that has a smoke machine. There are videos on youtube where people show how to use seafoam. Also, the car will need to be cooled down before they do the smoke test or the catalytic converter will eat up the smoke before it gets past it because that's what catalytic converters are designed to do, burn fumes. As long as the cat is cooled down the fumes will pass it and to the exhaust manifold and out of the spark tube holes if there is no leak.