trying to help get one of my moms cars running, car wont start. used the code scanner, came up a 0304 "Multiple cylinder misfire" so i checked out the coil packs and the plugs. they fire fine when cranking but may be out of sinc. also took out the fuel pump, the fuel pump doesnt "humm" when you turn the key on like most cars but does "humm" while cranking. no fuses blow either. autozone was NO help and the Haynes manual no help either.