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Im having the same problem on my 06 i have a jet kit installed no vacuum leak didn't have the problem till after the jet kit was installed. Im leaning towards the fuel filter or the air valve for the tank its almost like its not filling the bowl fast enough and the idle will go from 1500 to 500 and back between 1500 and 2000 dont know if yours is the same but if it will help ill let you know if i figure it out.
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