what you want to do is check cranking voltage on the connecter.if you think its a dead coilpack, what you want to do is have the car running. one by one disconnect each coil. if if its starts to ideal bad. then that coil is good. keep going until you get to the one that will not change idle. you will also need a noid light to test injector sig. you will have to take off the fuel pump relay and check cranking pulse.