I HAVE A 7.5HP MID 70'S MERC AND IM HAVING A RUNNING PROBLEM!THE MOTOR RUNS GREAT AT IDLE BUT WHEN I GIVE IT GAS IT BOGGS DOWN IF I BACK OFF THE THROTTLE IT RUNS GOOD AGAIN! ALSO HAVEING PROBLEM WITH NO WATER COMING OUT OF WATER PUMP DISCHARGE TUBE COULD THIS BE RELATED?I PUT I HAD WATER PUMP...