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Engine idles high when cold and then pulsates for a while…

Customer Question
engine idles high when...

engine idles high when cold and then pulsates for a while until it warms up

Mechanic's Assistant: How many miles are on the car? What size is the engine?

5.3 l 349000.

Mechanic's Assistant: What is the make/model/year of your car?

2002 chevy tahoe

Mechanic's Assistant: Are you fixing your Tahoe yourself? What have you tried so far?

Absolutely nothing

Submitted: 7 months ago.Category: Chevy
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Answered in 2 minutes by:
1/6/2018
Chevy Mechanic: Mike V., Auto Technician replied 7 months ago
Mike V.
Mike V., Auto Technician
Category: Chevy
Satisfied Customers: 27,762
Experience: 25 years automotive experience, Certified Subaru Tech and Nissan factory trained.
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Chevy Mechanic: Mike V., Auto Technician replied 7 months ago

This could be the result of a sticking IAC valve. Try removing the valve from the throttle body and cleaning it up with some carb cleaner. Clean the throttle as well. Reinstall it and if it resolves the problem, you are ok to leave it as it is. I am sending along a diagram of it's location on the throttle body to help.

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