I have a 86 f-150 with a 302 FI V8. Here is a summary: My truck kept stalling/loosing all power whenever it warmed up to normal Temp. and whenever I went over 3,000 RPM. I had fuel pump replaced in engine, didn't work, then I replaced the one in the tank. It now runs better under a load (over 3,000 rpm) but it will not run at idle at normal temperature now??

I checked the battery and alternator and both are fine. Once the motor cools back down, it will crank again and run fine until the engine warms up to normal temperature? Does anyone have any ideas what this might be?

Thank You!!!

 

I replied in the engine section.

 

I have no idea about your truck... I realize this is an old post...so for anyone reading....
I had an 80 Ford Escort long time back that would stop when it got hot. I would have to let it cool of before it would crank up and go again. My dad figured out it was some break in a coil...I don't know the name of it. It would expand from the heat and separate enough to loose connection. Cooling down, the very tiny wire in the coil would come back together and you could drive off again. Was a pain for him to figure out..

KC