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1981 Plymouth Reliant starts right up...Idles great....Give it gas back fries through the carb....even when driving down the road...After the back fire starts to idle rough....

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There are many reasons why an engine should spit back through the carb. I once encountered a Ford that had a worn exhaust lobe on the camshaft so the valve was barely opening - the engine ran very well until the throttle was opened. It is still a huge mystery how the owner had managed to drive it to my workshop.

The most common reason is a lean air/fuel mixture caused by one or more carb jets being blocked.

A thorough carb clean is a sizeable task that shouldn't be undertaken lightly and it is best practice to tackle it last after ensuring everything else is as the manufacturer intended it to be - from spark plugs and spark power/quality, timing, valve operation, fuel delivery quantity and pressure, etc., etc.

Posted on Oct 05, 2019


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6ya staff

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Posted on Jan 02, 2017


Travis Humphries

  • 1990 Answers


You need to Replace your Gas Cap. The Seal is worn and it is allowing Air to get inside the Fuel tank Causing your Rough Idle.

Posted on Jan 20, 2009


  • 957 Answers

SOURCE: P0301 - Cylinder 1 Misfire Detected on a 1998 s-10 idles rough

Sounds like a bad fuel injector. Shop would need to run a contribution test to confirm. I must say, good detective work, good luck.

Posted on Apr 29, 2009


Jason Phillips

  • 500 Answers

SOURCE: rough idle in gear 1997 ford contour 4 cyl ohv

probably a dirty idle air control valve

Posted on May 20, 2009


  • 4 Answers

SOURCE: 2003 tahoe idles rough and stalls

might want to check your mast air flow sensor. if your check eng. light is on have the codes downloaded

Posted on Jun 07, 2009


  • 322 Answers

SOURCE: i have a couple codes P0335,P0385,P0171,P0174. My

Resolve trouble codes and try again, if car runs ok no problem if not, write again.

Posted on Jul 16, 2009

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