ok ive been having huge problems with my car. It was hitting 4200 then just dying, kind of like bouncing off a rev limiter. Had it professionally tuned and all and they could not find whats wrong with it. Well i had the tranny flushed at jiffy lube and found out they put in Mercon and not Mercon V. Immediatley had it flushed at Ford and now it doesn't do that. Now what it does at WOT is rev all the way to 5000 rpm and not shift. However when i take overdrive off and punch it, it pulls and works fine. So basically it seems that when i floor it when in over drive it doesnt shift but without it, it does. What does this sound like?