I recently flushed boat after a day of baiting (ran fine all day) and occasionally I will do a light. It's on engine to rinse since I boat in salt water. Last evening as I did it ( was still idling on muffs) it missed terribly after bout 30 seconds (post spray). If even stalled, was able to start it and ran badly for a bit then cleared mostly up. In automotive world plug wires would be logical start but somebody once told me wires in marine environment hardly age due to cooler engine compartment temps. True?