heres whats happening, i stop at a light and my car is idleing at 750rpm(should be 500) i put it in park the idle goes to 1500rpm i tap the throttle and the idle goes back to normal. A friend told me it could be a faulty converter. the car idles okay after about 45 min of driving. the iac and tps are clean and adjusted correctly. does anyone have ideas or been through this problem. I have to stand on the brakes at stop lights couse it wants to go. thanks alot

 

What vehicle is it on?

 

its a 1987 transam 305tpi 700r4.

 

Could be the worn bushings in the throttle body/carbon buildup keeping the blades open slightly. I doubt this is a trans problem... If your pushing up against the stall speed of the converter it will try to pull through the brakes.

 

could be a lot of things, but it's not a converter issue. The tc can in no way make the engine idle to high, especially when in neutral.

 

X2 What year did they have the TPI and ColdStart Injector? IDK but could that be a possibility. Usually its a bad MAF or IAC.

 

thanks alot for the info. Even though i took the throttle body of and cleaned it, its got to be something sticking on the tps cause i shot a little bit of pb blaster where the throttle plate connects to the tps lever and it stopped doing it for a day or so.