I've developed a very bad miss under acceleration\load and figured it was a cop going bad. My GT Vert has 120K. I replaced the fuel filter and the problem remained. I put new plugs in, no change. I replaced the boots that connect the plugs to the coil packs and still no change. I figured all the above needed replacing so no harm no foul. So I'm %99.999 sure its a coil pack going bad but from what I've read there is really no way to know which one is bad and its not throwing a code or warning. If I wait will it finally die and throw a code so I'll know which one to change or should I just go ahead and change them all? I figure I'll replace them with Accel COPs since I can get them at a good price...the dealerships wants $106 each for them...what a joke. Any comments about or experience with the Accel product, good or bad, is welcome.