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My 2002 50 4strk runs really smooth at idle in Neutral. But,, when in foward at idle it will run very rough for 30 seconds or so then smooth for about 30 sec. or so. It will do this for as long as its in idle. Seems to run great above idle. Where do I start. Carb sync? Clean carbs? Or could the problem be something other than the carbs? Also something else I noticed is that after a few mins of hard running at wide open when I go back to idle there seems to be alot of steam coming out the exhust. Is this normal or could it be overheating with no alarm?? Thanks for your help!