99 Tahoe Maintains speeds even when throttle is "returned"

[custom97]

Do you have a Check engine light on? I would figure cleaning the TB would fix it.

 

[tapp1]

No CEL, and the RPMs did not change when put into neural(did not rev).

 

[Motopsycho]

Did you ever find I culprit for this problem?

 

[MattM]

replace the iac module on the intake. I just had these same symptoms and after alot of searching and some advice on this forum, I replaced the iac.

had trouble slowing her down, especially when the a/c kicked in.

10 minutes and 67 dollars later, my '99 runs smoothly and predictably again.