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Engine misfiring, backfiring and will not stay running at idle

Tiny
DARRELL EDWARDS
  • MEMBER
  • 1994 FORD MUSTANG
  • V8
  • 2WD
  • MANUAL
  • 150,000 MILES
What would cause my car listed above gt with a 5.0 302 engine 4 and barrel carburetor to skip, lose power when you accelerate and going down the road, won't stay running while idling and backfiring. I just recently replaced the head gaskets intake manifold and gasket distributor cap and rotor button also the carburetor as well.
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Thursday, March 18th, 2021 AT 9:01 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

I do not see anything about replacing the plugs. If they are not working correctly, it will misfire and stall.

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

https://www.2carpros.com/articles/how-to-change-spark-plugs

I would get a vacuum gauge and check the vacuum while the engine is running and at idle. You need 18-20 inches of steady vacuum. The backfiring concerns me as it could be valve related.

https://www.2carpros.com/articles/engine-backfires-while-running

Roy
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Friday, March 19th, 2021 AT 1:58 AM

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