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i have a used revo 2.5 it runs at idel or a little above idel but spits a mist of fuel out of the carb when engine is runnining and only runs for 2-4 minutes i can pull the muffler pipe off and it has a build up of fuel in it enought to drain some out. i even tried to cut the fuel flow adjustment way down like just enough to run engine and got the low air speed set at best to run a little pass idel. is it the carb or engine the problem.??