ok well this happened before but it was bad injectors leaking gas. when i start the car up it revs up to between 2-3,000rpm and stays there. if i drive it for awhile it will eventually go back to 1,000 but usu goes to about 1500rpm. chevy dealer said it was the thermostat staying open which is a bunch of crap because the heat works and the temperature gauge works. but tonight im gonna do a coolant flush & put in a 180degree thermostat. i thought maybe the idle air control valve was bad or dirty so i just cleaned it off, still idles high, i bought a new one, still idles high. the air filter and everything is clean. any ideas on what it might be? i don't wanna run it fast. im not sure what else it could be

 

i think that it is a piece that i dont know what it is called. but it is a hose that connects to the upper plenum on the intake near the schrader valve for the fuel pressure. it is just a boot on a fitting, but if it isnt sealed all of the way, it will cause a high idle. i had this problem when i forgot to hook this up, once! i have just totally forgot the name of the damn thing. it has been a long time since i worked on the 3.4 so i have forgotten a few things. but check that and see if it is the problem.

 

Vacuum Leak.....listen for hissing noises....

There are only so many vaccum lines on our cars....shouldn't be toooo hard to track down

Good Luck.

 

thanks for the input, i checked for vacuum leaks and there were none. i fxied the problem tho, dirty TPS connection. heh i replaced the wrong damn thing, oh well my IAC shouldn't have problems for awhile now. i cleaned the connection to the tps very well and now it runs fine.... or seems to at least. nice job on the chevy place telling me it was a bad thermostat lol. i guess they wouldnt make money on a bad connection so they lied. oh well she runs nice now.