I bought gas at a station that now looking back may not have been the best place to buy gas, and ever since have had a miss in cylinders 3 and 4 and the truck runs really crappy. I've since added gas from another station after running all the gas from other crappy station and the problem persists. I've checked the plugs, wires and everything i could think of to be the culprit and no such luck. I'm at a loss ???????