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When you crank up the vehicle it shuts off immediately?

Tiny
HEYWARD11
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 230,000 MILES
You crank again, give gas and hold at 1,000 RPMs for a few seconds and release and the RPMs will drop to around 400 and lower then pick back up but never exceeding 500 RMPs. But I've noticed that the RMPs when stopping dropping low and to me below 500 or even below 400 is low.
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Tuesday, September 6th, 2022 AT 10:46 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,320 POSTS
This can be one of two things, first I would service the throttle body, next I would check for vacuum leaks when the engine is cold only. These guides and video will help you fix the problem:

https://youtu.be/Z3LDHdS1upo

and

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

This can help as well:

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

Please run down these guides and report back.
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Wednesday, September 7th, 2022 AT 9:46 AM

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