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I have a 2007 Dakota 4.7, 117,000 miles with an idle issue that has been going on for awhile. It is not throwing any codes at all. The shop replaced the idle position sensor, new spark plugs, and complete fuel system clean. It idled good for a week.. The tach will bounce under cold or warm engine. Going down the freeway at 63 mps the tach hit 3000 then drop to 2200 and bounce between 2200 to 2700. On surface street I was going 15 mps and the tach hit 2100 and fives minutes later I was at 28 mph and tach was at 2500. At a warm idle the tach will bounce from 900 to 1400 then drop to 750. You can feel the gas peddle surge constantly.

Anyone had this issue or any ideas.
 
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