Got an 06 F-150 a couple months back with 80,000 miles on it. It has the Triton 5.4 engine and I'm getting what feels like a miss in it when the engine is lugged down in OD at 1200 to 1500 RPMs. Is this maybe 1 or more of the coil packs/spark plugs going bad? If I disengage the OD it seems to do OK at higher rpms. Second question is what does a tuneup on one of these engines run and when does that normally occur.
Thanks
Bob