Bad idle

I have a 93 teg gs with 190,000, on the odo. My problem is that my car will not idle at all, it hopes around from 500-150, and on good days it will idle from 1200-900rpm. It is very annoying sitting at lights because it shakes so much. The only thing that helps is that it will idle pretty good, but at about 1100 when the ac is on. Have replaced fuel filter, spark plugs, wires, cap and rotor, and the distributor/ignition computer. Only mods on it are the aem intake and a custom cat back exhaust. Have tried to remove sensors to trick the ecu to check for problems, but so far only has brought creep mode. Hopefully you guys can offer some advice, i hate paying a shop to check for problems, but its getting annoying so i might have to.

It sounds like you'll need to adjust the valve timing and clearance to factory specifications. You should be able to do it yourself with a set of sockets and 1/2" & 3/4" socket wrenches. You'll also need a feeler gauge to adjust the valve clearance. ... And of course, a good ol' Haynes repair manual.

I think its the IACV. I had the same problem. Clean out the IACV and reset the ECU.

i was getting alot of idle problems out of my GSR i had a bad map sensor and one time at the strip i overheated badly and cracked my head witch was sucking air in and telling my ECU i was running lean so it jetted super super rich, but your problem is idleing low i was idleing high and looping. just my 2 cents just thought i'd throw this in

Thanks guys, at least it doesnt sound like anything major, i just need a weekend off to check this stuff out and ill post when i figure out my problem. thanks

I think its the IACV. I had the same problem. Clean out the IACV and reset the ECU.

Good Call. I agree with almxdupintegra, start with the Idle Air Control Valve.

Hey ya all.. I just brought car last week ago...i was been research but could be anything.. I want to know that case by the coolant low? When i got up morning and start the car and come up to 2,000 rpm.. I was puzzle.. I thought it warm up then back to normal but still do.. geez.. i knew that something isnt right.. i took drive .. and high idle was stop and back normal.. strange.. until next day and it same again high idle 2,000? What is hell going on with it? ..... PLese tell me what is wrong with these.. Thanks!!!!!

if your car is cold it will idle at about 2,000 until it warms up.

Hey ya all.. I just brought car last week ago...i was been research but could be anything.. I want to know that case by the coolant low? When i got up morning and start the car and come up to 2,000 rpm.. I was puzzle.. I thought it warm up then back to normal but still do.. geez.. i knew that something isnt right.. i took drive .. and high idle was stop and back normal.. strange.. until next day and it same again high idle 2,000? What is hell going on with it? ..... PLese tell me what is wrong with these.. Thanks!!!!!
:wtf:is all that nonsense. please write in something we can understand.

also do what almxdupintegra said first. then if that still does not work you can check the Fast Idle Thermo Valve(FITV).