I have a 96 Cobra with a 4.6 4V. I built the engine awhile back and have been having some issues with my spark plugs fouling out. I'm running a Vortech charger at around 10 psi. The car is mainly street drivin. The car had a custom tune when i bought the car but since then i rebiut the engine and everything is basically the same. May have a little lower compression now. Anyways everytime i change the plugs I only get a few hundred miles on the before I start feeling it missing and it gets worst till its just busting up bad. I replaced my coil packs with Accell packs with no change to performance. Can't tell its running rich by sight or smell. Anyone else having a problem like this? I think it must be something in the tune that causing it. Where's a good place to get it retuned in Georgia? Anyone have any other ideals?