Note; Put a OBDII tester on, Showed 3 codes; Multi misfire, #1 Misfire, #5 misfire. Checked wires and the only place they meet is at a retaining clip.Insulated w/ electrical tape ,but will replace sparkplugs and wire harness. Thanks again for all the suggestions. It seems this is a weak point in the system that hasn't improved with newer models. FYI ; dealer price for identical Bosch wire harness is over $150 + installation. It is a very simple task to replace.