ok, does anyone know the symptomes of getting a bad tank of gas? i went to a gas station that i never went to before, got 10 bucks of premium, and 5 mins later the engine starts running rough. in neutral and drive, the engine shakes and makes the whole car vibrate almost like i burt through a plug wire or somethin.....the engine also doesnt have all its power there... i checked all the plugs and wires and they're all good. do you guys think i could have gotten a bad tank of gas? i would run out the tank, but i just got back to college and left the car at home... any ideas?