rough ilde no power on my ps

i have a 95 f-250 ps its just a coupoe hundred miled short of 400,00 miles the ene=gine would run rough no power then it would start running good then bad again had a guy tell me an injector was bad but i never heard of an injector coming and going like that ive driven truck for 4o+ years never had an injector do that they always go and stay gone i pulled driver side valve cover found the back wiring harnes had no lock on the plug could tha be the problem
 
Sounds like burned valve cover wiring to me. They get kinda intermittent like that for a bit then give up entirely. Pull all the connectors on the outside, and look for burned pins.

I had to replace the gaskets/harness's in both my Powerstrokes this year.

Ben
 
Randy, about 2 yrs ago my 01, 7.3 did exactly that, took it to my local Dsl shop, they did as you did, found a electrical harness had popped of on one injectors. Put it back on and all was fine, that electrical end popped odd again 1 month later, We replaced that LH harness assembly and had no problems since.
I will bet there is a problem, with that harness. If your engine runs as if there is a dead miss if one injector is bad or the entire bank quits as mine did the last time! Injectors just don't S#it Can at once Hope this helps.
Later,
John A.
 
I would sooner think the flex ring is gone if it starts hard and changes from rough to smooth. There is a fitting on the front of the pump pull it out and see if it is clear in there if not the ring is gone.
 

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