Been chasing a issue (well a few) with my ba 04 xr6t, but most recently, my car has been stuttering when I give it a bootfull around 3k rpm, straight away thought coils. However over last weekend I pulled one out at a time and put a screw driver in each coil turning car on and off one at a time, found that 2,3,4 don't seem to have to same amount of spark as 1,5,6. pulled the end caps off each coil, and the bottoms of all of em all have hair line cracks, so I thought this weekend I'll replace em all. Untill today here in Adelaide it's abit warm so been driving around with the air-con on, and had to put the foot down abit through a orange light and it didn't stutter, pulled up around the back street gave it abit of stink and reved all the way to redline without stutter, turn the air-con off and get the stutter back? WTF!