Yea thats what i thought at first also i put fuel injector cleaner in 2 times with the next grade octane up from regular i havent tried high test yet though. but after i burnt that tank i still had the same problem. People have told me it probaly isnt the fuel filter because it would have trouble starting and it has no trouble starting. Oh and also if im in like 3rd gear and hard on the gas the car with spudder. I can deal with it but i get really pissed if i cut out in front of someone and the car spudders and doesnt want to go. i just want to find out whats causing it. ill ttyl thanks again