well.. got my mustang.. washed the engine bay.. then replaced all 8 coil packs with the yellow accell ones from summit. 4000 miles later i have a misfire. Dead coil pack on #3.. switched #3 to #5.. and the code followed to #5. Replaced that coil pack with a new one under warranty from summit. Drove the car about 15-20 miles and now have another mean misfire and a flashing check engine light... so what gives? another dead coil pack? Is my SCT tune killing coil packs prematurely? Any advice would be great.