the EXACT same thing happened to me. it read cylinder 3 misfire, I changed the plugs and wires and that did not help (it was the first time i changed them and my mileage was about 90,000). my truck would sputter and run terrible for a week and then another week goes by and its perfect and then it would get bad again
I think it was bad gas, water in my tank. i had numerous mechanics check it out and because of the inconsistency of the sputtering, they thought it was bad gas. I went to buy some gas tank water remover from advanced (use 1 per tank) and after adding one to every tank for the next 5-6 tanks the problem had finally gone away, give it a try, good luck and let us know.
Last edited by black_edge4628; 06-13-2009 at 12:24 PM.