sparkplugs good, took off #3 #5 #6 wires supported them away from metal and the car crank up and ran, just like it before. i need new wires but can the coil packs be bad. it revs up ok and responsently but i'm amazed that it runs on 3 cylinders.can the wire be all and contributer to the car shutting off after it runs for 30 mins.