i have a 99 gt 72,000 recently the car started acting up then popped a check engine light code read cylinder 5 misfire. replaced all plugs cylinder 5 coil pack and all coil boots an springs. ran better but still missing at idel sorta and thru out the power range. i un hooked coil pack (cylinder 5) while the car was running an car ran the exact same still also un hooked injector an ran the same. basically it seems like its obvisouly cylinder 5 thats not firing but what other option do i have to try an fix this problem?????