Engine will not stay running?

2007 CHEVROLET SILVERADO
250,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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WANDAANDBUDDY
  • MEMBER
  • 14 POSTS
Just rebuilt engine for truck. Replaced old engine with rebuild one. Got everything hooked back up. Cranked truck and it won't stay running. It goes in limp mode sometimes. And sometimes when I turn the ignition off the truck stays running until pulling relay. I don't know what the cause is or what I can do to fix it. Please help.
Feb 24, 2025 at 3:59 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,548 POSTS
I would double check the battery to engine block ground and the ground to the chassis. Next I would do a relearn on the throttle body which is listed below, also run the codes to see if any are present. Sometimes moving the buttery fly by hand can reck the throttle body FYI. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.

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Feb 24, 2025 at 8:38 AM
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