New to post. New to motor and doing repairs. Motor is on 20 ft pontoon. Motor dies/ kills after 2 hours run time on lake. Won’t start. Wait 15-20 minutes then starts. Had it in shop twice. Shop believes fuel side issue. Replaced tank, fuel line, rebuilt fuel pump, replaced fuel filter, cleaned rebuilt all three carbs. Still issue. Speaking to friends believe electrical side not fuel side. One told me to replace coils. Ideas?