I have a 1997 f-150 4.6 motor and it runs perfectly fine until I hit a bump and then it cuts out to the point it almost kills the engine and today it has started killing it. All my electrical stuff stays on and the motor is the only thing that dies. Any suggestions as to what causes this? Any help or ideas is appreciated.

 

I used to have a Chevy that did this. Go figure. It turned out to be the fuel pump relay would wiggle itself lose from the fuse box. Cut a piece of foam and stuck it in there to hold it down tight and no other problems. That's about all I got for that one. Sorry!

 

Sounds like a failing fuel pump.

 

I vote PCM ground. Go over them all tho.

Re-do the inside, under both kick-panels and then firewall grounds. Also make sure the cab to frame rail ground is okay. It's right under the passenger side floor board.

 

Turns out it was just a bad connection from when I replaced my starter relay from when I replaced that on Monday. Thanks for all of the other options though.