Ive had this problem for 6 months now and id like to address the issue. any help will be appreciated

1998 v8 3800 Camaro
5-speed manual


When i start the car it will stall out immediatly unless i give it gas for a few seconds. This happens when i dont drive the car for about 4 hours. Otherwise when i start it, it will shoot up to 2000 rpm and just stay there. Sometimes. It stays at 1000. this will act as the lowest idle unless i shut off the car and turn it back on. I often do this when i drive to reset the idle to 1000. If i accelerate quickly and hit maybe 60 or 70 and pop it in neutral, it will drop to 1000 where it is supposed to be. Sometimes when i coast to a stop light in neutral my rpm's will fluctuate between 2000 and 2200, but when i get below 10mph, it will stay at 2200. Like i said. when she idle's high when im driving, I tend to shut the car off and turn it back on, then the engine idles at 1000. Its very annoying and i dont know how much more my starter can take. There were some days in the summer where it acted perfectly fine with no high idle.

Im thinking maybe a vacume leak, but the lines look hard as hell to get to and i dont have a diagram. Air and feul filter are brand new. i replaced both the TPS and IDLE air contol solinoid on the intake. Check engine light- codes read high idle and TPS read error, even after i replaced the TPS sensor.

I REPLACED CRANK POSITIONING SENSOR AS WELL

check engine light is currently off

so any ideas????
Thanks for the help

 

Seems like your on the right path. Next step would be to look for vaccum leaks. That can also cause your idle to rise.

 

check the vac pipe to brake servo , ive had this problem before