Hey this has been bothering me for about a month now and I just cannot figure it out. The car sputters and backfires thru the intake. When you put your foot to the floor it completely falls on its face and doesn't wanna go at all, but once you get it going from a stop you can go use about 1/4 to 1/2 throttle an go as fast as you want. I'm completely confused on this one. I know a big part of the problem was bad gas, but it's still having issues now. I've replaced o2 sensors, ignition module, fuel filter, and am running premium from a different gas station. I'm about to run injector cleaner because I believe it could be clogged injectors after seeing all the black junk that came out of the old fuel filter. Any other ideas from you all would be much appreciated.