1991 3.4 DOHC fast idle problem

[whip]

I have a 1991 Gp that had an idle problem. Everything I read pointed to change out the intake gaskets. I have did so and changed out the IAC valve also. I have checked for vaccuum leaks also. This car still will not idle down below 2000 rpm. Any ideas would be helpful. Thanks.

[Q-Ball]

How long has this been going on for? How many km or miles on your car?

[Crazy K]

ditto on above.

 

 

try... unplugging the TPS sensor and seeing what the car does.

[whip]

The car has had a motor change done to it. Motor is of 94-66 vintage. Mileage unknown but runs good. It has a hyper chip in it.

[Andrew]

has this only happened since you swapped motors?

 

try the TPS that ken suggested.

[ns87]

Also check the car's coolant temperature sensor (not the one for the gauge). If its reading too low, it'll force a high idle

[whip]

Hey guys! Aprreciated the advice. I changed the cts sensor , but it still idles up[ to 25000 rpm right away. Also took the tps out and reinstalled it ,but it diddn't change anything. I have did alot of work on my cars on my own, but this headache is driving me insane!!! I have also rechecked the throttle linkage and TB for binding and there is none. Keep giving me ideas!!!!!!!!!! Thanks.