1957 Chevy straight 6 230 Drive home tonight engine started sputtering a little when I accelerated. Got home in the drive way noticed it was idling very rough. Change fuel filter, checked plug wires. Ignition coil, if I replace does size matter? Rotor? Check vacuum? Not a mechanic, bought the truck so my kids and I could work on together and learn together. My point, I will probably ask stupid questions.