"I have a 1990 Evinrude 120 HP
"I have a 1990 Evinrude 120 HP looper. It starts, warms up and runs good to full throttle. After about 5 minutes run time at full throttle, it suddenly drops to about 1500 RPM and misses bad, but keeps running. If I shut it down and let it set for an hour it will...