Mercruiser Broken Cativation Plate Mercruiser 470 Backfires Out Of Carb

Mercruiser 470 backfires out of Carb - mercruiser broken cativation plate

My 1983 Mercruiser 470 has begun to spread, while min-cruise. Now she is not receiving full speed, I'm 3500 and then for a short time, it will in 4000, but some minutes from 3500 to 3800 rpm. Placed at the beginning of the hole a lot of carbohydrates and sometimes outside. I also found that the punch slowed when there is a hesitation before the engine responds with a pop-lean or acceleration. I changed the text and condenser, fuel filter changed, and even with 10 micro-generation fuel-water separator Filer ... But I still have this problem.

Has anyone an idea?

Thanks