i have a 99 gsrwith a skunk2 intake mani and built bottom end with all oem parts. anyways my car wont idle until its warmed up. sometimes it idles at 1500 and like pulsates..also if im cruising in 2nd 3rd gear about 25 mph and let off the gas it jerks real bad. i put in a new tps and the jerking started .help please i have no idea what else to do!

 

Maybe try cleaning the IACV

 

yea i was thinking the iacv could be bad but i think its the tps and iacv. i will prolly just replace both again and see what happens

 

Before you replace anything try cleaning them first. You can use break cleaner on a iacv and i think the tps too. Maybe you should give that a try before spending money.

 

yea. my friend told me that you have to adjust the tps? and i knew nothing about that either

 

My car has the same problem, does your coolant meter gets really cold when you high rev the car? Mines does that all the time when I drive it.
I also cleaned my IACV, but still doesn't work. Possibly needs to be changed?

 

I would suggest to check for vacuum leaks before anything.

 

yea ive done that and havnt found anything. also when i put the skunk2 manifold on, there is a coolant line that runs from the left side of the head closest to firewall and it went to the stock manifold now i have no idea where it goes it just is blocked off for now.

 

The next thing I would check is idle screw and make sure that nothing is touching your throttle spring. After that, check and maybe replace your throttle body gasket and intake manifold gasket.

 

The first thing you should check is the voltage on your TPS.

.4 closed and 4.5 WOT.

Which TPS did you use? I purchased an OMNI Power and it did not work. I have to send it in for warranty.

Replaced with a used (known to be working) TPS and NO PROBLEM

 

i used one from a single cam vtec manifold. my friend had given it to me and he has a 230whp b20vtec in his teg so i figured it would be right. it still does the same thing it did before i changed it but made it worse to with the jerking when i let off the gas. but it doesnt throw TPS code now...

and for the voltage. i have an ohm meter from UTI so i can use that but where do i check it? unplug it and check it that way?? or what

 

no, you have to keep it plugged in. I believe its the middle wire you have to measure

 

make sure the key is turned to "on"

 

also another thing i forgot to mention is if i pull up on my gas pedal or pull the throttle pulley to close the throttle body my car dies? i know thats def not supposed to happen.

 

not supposed to happen. your problem is with the Intake Manifold/throttle body. Probably both mismatched

 

so what could i do to fix this? get a s2 throttle body?

 

anyone that could tell me what the exact problem is please PM if i cant figure this out im just gona sell this car bc its been nothing but problems. it runs worse since the rebuild. and its leaking oil between the block and head....right above block code

 

Why not go back to stock IM to see if that fixes the problem?

 

Im not saying its easy... Just logical IMHO

 

i would if i still had it . i dont know what else to do. ive checked every vacuum. my motor was just built 3k miles ago and it doing the same problems it did before.i mean it runs fine and performs well it just idles like **** and acts weird

 

look to see if you are low on coolant. i was and i added some and it went away

 

what would that have to do with anything. and i know thats not the problem bc it did this before my motor rebuilt and it has all new fluids

 

I'm not exactly sure. But I had the same problem and I was low on coolant and I added some. Has anyone heard of this before

 

my coolant is always full and always does it.....idk

 

i checked the voltage on the TPS idle it was .495 and WOT it was only .795