I have an 02 F150XL, 54,000 Miles, 4.6V8, 5speed. About 5,000 Miles ago, I got a BAD Tank of Gas. I quickly replaced the fuel filter, plugs, and treated the tank. However, I am still having acceleration problems. When I press on the gas I get a misfire(that is the best way to explain it), a quick hesitation. It is something that is not a constant. It could be when I am in 2nd or 5th when I am passing. Same problem. I have read that it could be the computer readjusting to the "gas on demand". I don't know where to go next. Any help would be great.

 

could be clogged injector.the fuel sending unit is clogged and reading fuel flow incorectly causing a rich condition which will cause a missfire because to much fuel and it gums up the plugs. pull a couple of the plugs and check em out. run some B12 in the tank like a couple cans and it should clean out and crap and disolve it. bad fuel can cause alotta problems these days

 

I'm with faster on this one. Aslo cpo369 what kind of fuel mileage do you get?

 

I run about 50 Miles a day on it. I average about 16-17.5 mpg. Faster, you said something about B12. What is it and where can I get some?

 

just under 4 bucks for a Can at walmart its blue red n white can mostly blue though. but just buy a can or two and run it through next time u put gas in. it will clean out anything. it burns white though so if u get a bit of white smoke or a different smell ur alright thats just ur engine burning the b12

 

Thanks for the input.