Rough idle... only when warm.

Mopar Performance Issues

  1. jdsduster

    jdsduster Well-Known Member

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    any luck?updates?
     
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    • Rolling_Thunder

      Rolling_Thunder Rolling Thunder

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      I had a similar issue with an engine a customer brought into the shop one day- very different as it was a 440 with aluminum heads, aluminum intake... the engine builder only used a stamped valley pan... what happened was the expansion of the heads/intake were so much that a vacuum leak developed on the intake track of cylinders 2/4 and leaned the cylinders out to the point they wouldn't fire... caused the engine to idle fine when cold but started running rough once it warmed up.
      Again - very different engine but that's something I have personally seen create the symptom you listed.
       
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