On my way to work the other morning, cruising about 65mph I all of a sudden lose RPM. I coast to the side of the road where it's idling very rough and the rpm's are fluctuating between 300-800 rpm sounding like it wants to stall out at any second. The truck restarts fine then goes into the rough idle and there is no throttle response what so ever, pedal to the metal and nothing.

So I changed the MAF nothing, went fuel pump and filter and the truck runs amazingly. Make it to work with no issues on the way back it happens all over again. This time when I goto restart it, it idles for about 10 seconds then quits.

Any suggestions would be appreciated..

FYI no bigs mods done

99 108,000 miles

JL air filter and intake tube
flowmaster exaust
90mm maf
diablo programmer set to just 90mm and 93 octane setting
Thanks

 

any codes???

 

check your fuel pump resistor:

https://www.f150online.com/forums/li...its-alive.html