it drops then picks back up but some times completely stalls?

1997 DODGE RAM
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EREARDON
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i have a 1997 dodge ram 1500 truck with a 5.9L. When i let off the gas it wants to stall. it drops then picks back up but some times completely stalls mostly at slower driving speeds like in town stop sign to stop sign. do you have any suggestions to help??? map sensor our throttle position sensor?? thanks for your help and time everett
Jan 2, 2010 at 9:04 PM
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SQM
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Hello,

This could be due to a dirty idle air control valve (IAC).
A dirty IAC will not have sufficient air flow through it while the engine is off throttle and that can cause the engine to bog down or even stall when at idle.
Cleaning out the IAC can improve the drivability.

Here is a helpful guide:

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

I have attached diagrams below for your reference.

Let me know of any questions.
Thank you.
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Jul 22, 2022 at 2:16 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.