2007 Ford F-150 Q&A
2007 Ford F-150 Question: why doe my truck have a shake to it at around 55 until the engine warms up?
Misfire,When the vehcile is under load a coil demands on a sparkplug are greater so your you are looking at a misfire, you are equipt with a COP (coil on plug),Also because you are a F 150 go to the passenger side at the rear of the sparkplug area look for coolant leaking into the sparkplug chambers that also causes misfire, Above all else it is time for a tune, will it fix this you bet, unless you like going to gas station - Randico
could be serveral issues with water in plug hole,heater hose above it leaking. thats most likely why it runs rough cold. when water dries the misfire is gone. have cooling system pressure tested to determine leak and that might repair misfie also - globalhelper