i just had my carbs rebuilt and cleaned on my 1982 75hp evinrude i took it out to the lake and it would hardly run so i took it back to the shop and he put it on muffs and it fired right up and ran like a champ so i took it back to the kake and it ran like crap again got it to the house an put it on muff and again it ran like a champ i dont understand please help thank u