as soon as you go uphill at 40 it bucks
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2006 Ford F-150 Question: My truck starts bucking between 40 and 55 mph when I accelerate it goes away
Answer #1pushrod August 01, 2014, 08:07Master
Engine misfire... Usually one or more of the coils over each of the spark plugs... Problem is which, there are 8 of them!!! IF check engine light is on, have it scanned to find which cylinder is at fault... Also... 'scanner' can run a cylinder contribution test to locate problem cylinder... Bottom line... Get it tested!!