Oh remember something else, Someone at my school said that with the newer cars and the electronic fuel control if one of the plugs isn't ignitning enough gas, the car will over componsate by dumping in more fuel. I think he meant, that if the car thinks the cyclinder isn't producing enough power, the car puts in more fuel because the chip thinks its because lack of fuel to actually burn. Which would cause mass build of crap in the EGR passageways. Just another thought to put out there lol
