i hooked my car up to a tech 1 the other day and found out one of my cylinders is missing at idle, what could cause this? is it purley ignition? I havent had a chance to swap coil packs but i just did a tune up. just curious cause i also had my egr leaking and when i looked at the #3 injector it looked in bad shape but it was just the outside of it. car has 96,000 on the clock and just curious if a worn cam or something could have to do with this, i could post scanmaster numbers but all are in check 