it wants to turn off and I have to press the gas, so it does not?

1994 GMC C1500

200,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC

CHIVO_VERA234

MEMBER
1 POST

I’ve had my truck for a while now and only changed the battery, alternator and the fuel pump. now when i turn it on it turns on good and all, but when I put it on drive and start driving it feels like it wants to turn off and I have to press the gas, so it doesn’t.

Dec 18, 2022 at 10:42 PM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

This can be one of two things, either the IAC motor needs to be replaced and throttle body serviced, or you have vacuum leak. This guide can help you find the vacuum leak (engine cold only) and in the images below it shows where the IAC motor is so you can change it out.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

This guide can help you service the throttle body and IAC passages:

https://www.2carpros.com/articles/throttle-actuator-service

and

https://www.2carpros.com/articles/stall-at-idle

Check out the images (below). Let us know what happens and please upload pictures or videos of the problem.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
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Dec 19, 2022 at 11:08 AM