I had a horrible miss all the way through my rpm band. couldnt drive the car normal, ran fine at full throttle. I plugged off my egr (just did headers, and wouldnt not bolt up), then i proceeded to pull the plugs. All 6 plugs had carbon deposits all over them, #4 was hand tight, and the gap was completely closed on #6 (just had timing belt water pump job done). So I dont know if it was something they did cause it didnt miss like that when i took it to them. Anyhow i put new plugs, new coil packs, and new boots, the miss is gone. I test drove it then pulled #6 again to see if the cylinder was hitting it and closing the gap, and it is NOT...any ideas as to what may have caused it? Do I need to check again??