i have a 05 cobalt with north of 125,000 on her...she runs like a champ but i have to replace my coilpack. i have gone through 2 ICUs and im wanting to replace the coil pack. i bought one from the parts store and i installed it and it sounds like a WRX...i put the old one back on and it runs fine...so i returned the one one i just just bought thinkin it was messed up to staart with...so i returned it and got a new one...installed it and it still sounds like a wrx with a new coil pack...not sure if im forgetting anything...i install it just like i re install the old one and it doesnt work correctly...............What am i doing wrong i dont wanna keep buying ICUs...they are not cheap