I let off the pedal it stalls

1999 PONTIAC GRAND AM

190,000 MILES

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When I start the car it starts fine when I give it gas and keep it above 1000 RPM's but if I let off the pedal it dies...I can start it up with no problem...same if I am driving it..have to keep foot on pedal to keep it running..do you know what is going on? Oil level is good...

Mar 11, 2013 at 4:38 PM

SQM

CAR REPAIR CONTRIBUTOR
6,383 POSTS

Hello,

It sounds like you could have a dirty idle air control valve (IAC).
Over time the IAC can become dirty and have restricted air flow inside. This will cause the engine to either have poor idle or not to idle at all, as the IAC controls the engine idle when the throttle is not used.
The IAC can be serviced by cleaning it out. Many times that will fix the idle issue.

Here are couple of helpful articles:

https://www.2carpros.com/articles/how-a-idle-air-control-valve-works
https://www.2carpros.com/articles/idle-air-control-valve-service

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.

Images (Click to enlarge)

Sep 30, 2021 at 9:54 PM

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