Have a 1994 75 mercury which seems to load up after running just above idle when trolling even for a short time. When I give it more throttle it misses and smokes until it clears out and then runs fine. always idles good and starts good. Had it in twice . First they set timing, adjusted carbs and checked compression and said it was good. Tried it and still ran the same. Went back and they put thermostat in and told me to try that. Went out yesterday and same problem. Any suggestions thanks
