when im driving along for sometime my truck will start to become sluggish and loose power .A hill that i usually fly up in 5th gear ill have to downshift to
4th to make it up the same hill.It sounds and feels like im driving a big diesel by the way it hesitates when shifting.It will do this for a couple of days and then maybe on the third day ill go out in the mourning and it will be working great and ill drive it for a few trips and it starts all over again.It eats gas when it runs like this as you can imagine.The truck works really well when it is running normal. Loads of power and really goodon fuel too.it seems to do this when it gets warmed up but the gauges are all reading good. I WOULD REALLY APPRECIATE SOME ADVICE ON THIS BECAUSE ITS DRIVING ME CRAZY.I have some ideas of what it could be but dont have enough cash to try everything by hit and miss.(maybe coil,air and fuel mixture,changed 02 sensor already)yours truly confused