Join Date: Mar 1999
Location: College Park, MD USA
I have an 86 IROC with an LG4 and a Q-Jet. Lately, I've been having problems with high idling. I have had problems before, and at first I thought it might be the choke sticking, but I'm not so sure anymore...
Here's the problem. When I first start the car, It'll idle around 2000-2500 RPM. Usually after a few minutes the engine will rev a little higher, at which point I can kick it down to a normal idle. Now, however, if I attempt to kick the engine down, it will just hover around 2000-3000 RPM.
If I let it warm up for an exorbitantly long time, or if I shut it off and re-start it, I can get the engine to kick down to a normal idle, but when I rev the engine up to about 2000 rpm, it will "stick," that is, it will start idling high again until I kick it down.
Usually I can let it warm up after I kick it down and it will operate normally, and I have tried spraying both the throttle linkage and choke with Gum-Out. It appears to help at times, however whenever I start the car I have the same problem. It may be a vacuum leak, but if that were the case, it would idle high ALL the time, wouldn't it?
Sorry for being over-detailed, but I think the more I say, the easier it'll be to understand the problem. Any ideas would be appreciated.