I have been struggling with this idle problem forever!! I have put in a new TPS and replaced some vaccuum lines that looked bad. The only thing else i can think of is the IAC but i have taken it out and cleaned it but that didn't help. I have also cleaned the whole TB out. I was thinking it might be a IAC but before i drop 45 bucks on a part i'm not sure if is bad i want to be sure. Is there any way to check teh IAC or you got any ideas of what would cause an irregular idle. It just jumps around once in awhile and sometimes it gets stuck around 2 grand. any ideas?

 

took my car to shop for same problem, told me they clean connections on computer.

 

what connections and how do you clean them?

 

had an idle prob also. could be different things. my fuel presure regulator was shot and would make the car idle up& down( replaced it part cost $22) also i had mainifold leaks, and bad vacum lines. try seeing if u have leaks around the mainifold and bad vacum lines.

 

What is the TPS voltage at idle?

Have you set the minimum air position of the throttles?

 

i was playin with the tps today and think i may have helped the idle but not completly. don't have a Volt meter with me. gotta wait till tommorrow for my friend to bring it back. where do you plug the Volt meter into anyways. and yes i set the min air. taht was offf a little too. the throttle still seems to get stuck though. hmmm

 

When my IAC took a dump on me my car would just straight not idle. Is your car shooting any codes? When my car had an erratic idle one time it shot out a Prom error code. I had the chip reburned and it was back to normal.

 

no there are no codes coming up. i took her for a ride today and the whole idle problem that i thought i had eliminated a little bit has in fact no changed and i'm back to the same problems

 

my idle problem is back also.

 

i ran the car with ac on and did not stall, had a little shake at times, going to check for fouled plug/plugs.

 

Lots of MAF cars with idle problems....

How do you have your PCV system hooked up?

 

stock.

 

So, the fresh air supply, that goes to the valve cover opposite the PCV valve itself, is that still stock? Hooked up to the TB like it's supposed to be?

A 90 wouldn't necessarily have the same issue as a MAF setup would. Erratic idle could be caused by some other things on a S/D setup.

 

Yes to fresh air. S/D ?

 

my PCV system is stock as far as i know. What should i look for in the PCV sys. that would cause idle problems?