Engine bogs and shuts off sometimes?

1981 JEEP CJ7
200,000 MILES • 4.2L • 6 CYL • 4WD • MANUAL
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MWINDER77
  • MEMBER
  • 1 POST
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?
Sep 28, 2025 at 10:24 PM
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BLACKOP555
  • ✓Experienced 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.
Sep 29, 2025 at 11:01 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,051 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.
Oct 1, 2025 at 2:08 AM
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