darrellbierback
New member
2003 sea ray 4.3 mercruiser ,it all started when i blew out a trac in my headgasket from my cylinder to the pushrod hole and melted the plastic baffel in my valvecover.i replaced the headgasket,and valvecover.but it didnt run right after that.it boggs under load in the lake,barely making 1200 rpm,but works good with the muffs on in the driveway.so first thing i found was some oil in the top of my coil,so i replaced it thinking this was breaking down under load,didnt work,then i got rid of the electronic ignition because the spark wasnt being advanced,found a mallory dual point ignition to try, didnt work.then i replaced the carb with a 450 cfm holley,didnt work,rechecked firing orders,replaced wires,fuel filters,checked fuel pressure,im really loosing face here,my wife is at witts end with me,and i could really use some help,is there anything in the leg that would rob power or in the exaust manifolds that would do this??