Engine idles too low when warmed up

25,000 MILES • 4.2L • 6 CYL • 2WD • AUTOMATIC
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ROBERT COMMINOS
  • MEMBER
  • 1 POST
I live in Las Vegas and this generally only happens in the summer when it is very hot. I start the engine in the morning it idles high at 1,000 rpm's and then settles down to about six or 700. After I drive in a while, park it, then get back in and started up it wants to idle at around four 500 rpm's and if you put it under a load such is turn the steering wheel it wants to stall out and stumble a bit before you get underway. After you are underway it is no problem at all. Generally this is a problem in the summer heat. Not so much in the winter.
Jul 28, 2018 at 5:45 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,604 POSTS
This sounds like you have a vacuum leak. Here is a guide to help you see what is going on:

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

Please run down this guide and report back.

Cheers, Ken
Jul 29, 2018 at 9:23 AM
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