My engine is slow to return to idle after

[94 RT/10 Black MAMBA]

acceleration. It seems to want to dwell in the 1200-1500 RPM range for extended periods (5-20 seconds) even though it's at operating temperature. I've checked the springs and they seem strong enough. Could this be some kind of computer control problem related to the cold weather?

 

[Steve-Indy]

One also wonders about intake manifold gasket problem...though, with ours, idle occasionally held as high as 1800 after liftoff. I'm sure others have more ideas as well. Good Luck,

Steve

 

[Nadine UK GTS]

What about a sticky idle air control motor unit (?) if so it should set a trouble code (I think it's "25" you can get them up with out going to a dealer by turning your ignition key on / off consecutively three times, and counting the times the instrument pod light flashes, when you count 55, flashed as 5 and 5 this is the last code stored indicator)