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truck seems to clean the exhaust filter whenever it feels like it,twice a day this week,25 miles between events.i call them events because anyone behind me is lucky to stay on the road with all the smoke.15000mi,truck has done this off and on since new.dealer reprogram seems to have really screwed it up.they say they cannot duplicate problem when i bring it in.any help out there would be appreciated.do i have to get the 6.7