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Vibration at 50mph top gear 6.0l
Hello, my 6.0l powerstroke seems to have a miss fire, ir runs ok and has no smoke from the exhaust. When i get up to 50mph and it goes into top gear i get a vibration when putting my foot on the gas. I can push the tow button and the gear shifts up and vibration gone or put my foot down where it kicks down a gear and ok again. If i get up to 70 and it goes into top gear the i get no vibration.
Truck is not as responsive due to mis fire but still drives .
Truck is in the U.K. and our mechanics just re not interested in trying to fault find. an anyone help please ?