Why does the engine act like it is going to shut off on me and the A/C gets warm for a second and the RPMs are going up to 1,500 then back.

Hi Cody, the first thing I would suggest checking or servicing is the idle air control valve (IAC). The IAC is responsible for maintaining engine idle speed.

When your foot is off the throttle, the throttle plate totally closes. At this point, no air can get into the engine, and it would stall. This is where the IAC comes into play. It allows a metered amount of air to enter the throttle body to keep the engine running. Actually, when you turn the AC on, the computer requests the IAC to allow more air in to increase the idle speed and accommodate the added load on the engine.

If you look at pic 1 below, I circled the IAC. Again, it is on the throttle body. However, before replacing it, first, check the connectors. Make sure they are clean, not damaged or corroded, and have a tight connection. If that appears good, then remove it. It's held in by two screws. There is an o-ring where it mounts, so be careful not to damage it.

Inspect the pintel on the IAC for corrosion. If it is clean, check where it attaches to the throttle body and make sure there isn't carbon or any dirt in the TB. At this point, I would try servicing it. Here is a link that explains how it's done:

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

If that doesn't work and you decide to replace it, here is a link that explains in general how it's done:

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac

If you look at the remaining pics below, they provide the directions specific to your vehicle for replacement.

Let me know if this helps or if you have other questions.

Take care,

Joe

See pics below.

Cody,

Thank you for the update. I'm glad to hear you found the problem. I don't know if you already replaced them, but here is a link that explains in general how it's done:

https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

If you have already replaced them, is everything working properly now?

Take care,

Joe

Hi,

Cody, if the post will be on a different topic, please start a new one. If it is related to the same issue, we can continue here.

We try to keep the posts specific to one topic so it's more helpful to others. I hope you understand.

Let me know.

Joe