Engine bogs and shuts off sometimes?

Tiny
MWINDER77
  • MEMBER
  • 1981 JEEP CJ7
  • 4.2L
  • 6 CYL
  • 4WD
  • MANUAL
  • 200,000 MILES
Engine idles fine, but when you give it gas it bogs down and shuts off sometimes. Ran it a few minutes the exhaust manifold got cherry red. Any suggestions?
Monday, September 29th, 2025 AT 5:24 AM

2 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,386 POSTS
Sounds lean. Try adding extra fuel. Or checking for vacuum leaks around intake with it running. Revs up with brake clean you found a leak. If no vac leaks I would check fuel supply.
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Monday, September 29th, 2025 AT 6:01 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Does this car have a catalytic converter? it might be clogged or the engine is running rich, can you please remove the spark plugs and upload an image here so I can see? In the meantime please go over this guide:

https://www.2carpros.com/articles/why-an-automotive-engine-will-run-rich

Please go over this guide and get back to us.
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Wednesday, October 1st, 2025 AT 9:08 AM

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