I have a 1990 f150 4x4, its an automatic with the e4od tranny and the 351w motor. The problem is i have replaced the battery, starter, coil, and selenoid, and despite all of that after i drive the truck and it warms up it will turn over real slow a couple times as if it was a bad battery, then it turns over regular and starts. The more times i stop and start the worse it gets, but the next day its starts fine for the first time again. I would like some input to see if anyone has ran into this problem before and what i could try next to fix it. Thanks.

 

Battery cables. Change them both out and run an extra ground cable from the starter to the frame. With the negative just run it directly to the starter and cut out the old one that goes to the frame down bellow.

 

X2 on the battery cables i had the same problem and it turned out to be the negative cable
Rubbing on the motor mount .

 

Thanks guys I will give that a try I hope it works I was close to buying a new icu il let you guys know if the cables fix the problem

 

I really appreciate it guys I replaced every wire with 2 ga and it starts like a champ now