My '88 Sea Ray with a 4.3L 2bbl carburetor runs like a dream when it's cold and at cruising speed. Once it warms up or I give it full throttle it bogs, then losses RPM's and power. Then it heats up, starts to make a "tinging" noise and won't get up/stay up on plane. I've had a new ignition module/distributor cap/rotor installed. I also installed a new "anti syphon" valve, but no change. The water filter/separator and fuel filter are both clean/good. The engine seems to heat up when this happens.. Once I power down and the engine cools it runs good until it heats up again. What should I check/ change next?