Well that fixed it for about two days.  Drove it for about a half hour this morning and by the time i got to my destination, it was idling/revving right back up there, maybe not quite as bad but still undrivable.

Fixed it guys, replaced the injectors with some 99 GP injectors.  Idle fell back to normal like clockwork.  Thanks for the advice.

I am running the stock chip.

I have ruled out the crossover, as it appears to not be leaking.

I have boost leak tested it, and there is a tiny vac leak that I haven't been able to track down, but would that not make it idle high all the time?

I also noticed that when it idles high, if i tap on the diaphram of the Cruise control enough to raise the idle, it will quickly fall back to to regular idle.

Thanks for the suggestions, i'll attempt to test the injectors.

Well my 1990 STE is having some more problems.  When I start it up it idles normal, however as soon as i put it into gear the idle will raise up to about 2500-3000. Thus meaning the car will accelerate itself rather quickly without me touching the gas. However as soon as I slow down or get near coming to a rest, the idle usually falls back down to normal.  I have just replaced the plugs, wires, and 02 sensors.  I have checked for vacuum leaks and there are no major ones, definetly not enough to cause this sort of thing.

My only other thoughts are bad ecu or possibly a clogged cat, but i don't think the cat could create this sort of a problem. Does anyone else have any ideas?

Hey guys I was finally approved for membership over here.

I recently bought a 1990 STE with 119k on it for 200 dollars  :icon_biggrin: As you can guess the car needs work.  It ran and drove when i bought it, but idle around 3000 rpms immediately after startup.  I changed some plugs and wires, and switched out a few sensors and it seems to be idling better.  There is also a slight misfire but that could be partly because of the year old gas still in the tank.

Also the PMIII was not functioning. The pedal would go down a way and then get real stiff, barely slowing the car down, I took a closer look and the rear calipers are shot, its missing a rear rotor, and they are not getting any fluid at all.

Obviously this car is a candidate for a vacuum conversion as the PMIII system appears to be total shit and I could care less about ABS anyways.

I have sourced a vacuum booster/master cylinder from 90 lumina, but have not gotten the firewall plate as it would be hard to remove the complete dash at the junkyard.

Anyways thanks for reading.  Any suggestions/advice/ideas are welcome.