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1998 Jeep Grand Cherokee Question: What may cause vehicle's idle to lope after startup? Once cycles then runs fine.

 

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truezam, Michigan City, IN, July 27, 2014, 07:51
 Rookie

Inline 6.. upon startup everything appears fine. Minutes into it however engine begins to lope as if it wants to stall. but doesnt. Couple minutes later...begins to run fine and will until engine is shut off again. Process begins again everytime despite hot or cold engine and or weather conditions. Changed many sensors. NO engine light. Could this be a vacuum issue. I read engine loops after so many minutes and it appears once this process is complete, engine runs fine. Im at a loss....please help

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