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Yes Duncan its only at idle....and you would think that the 3 Diesel tech's and 3 Ford Field service techs that have come out and worked on this might have tried or thought of it....but I will bring it up to them as its going back in to the shop monday AM.....
it pulls fine has pleanty of power , and gets good gas mpg....when you come to a stop at a Stoplight or park the truck ...in a aprox 1-2 min it will start...the idle goes from 750 down to 500 then up to 1000 then back down to 750....and it will keep doing that for approx 5-8 min..then it will go away...
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