Hi,
I need a better understanding. What happens at a stop? Does the idle speed fluctuate? It can't shift from first to second, so I'm trying to get a better understanding.
If that is the case, you may want to check the idle air control valve (IAC). The IAC is responsible for maintaining idle speed. It is located on the throttle body.
I would check there first. I attached a pic of it below. Pic 1
Here is a link that explains how to service one. Try this and let me know if it helps.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Monday, May 9th, 2022 AT 7:21 PM