What would cause a Redmax 2600 I think is the model to run or barley run I should say for the first 2-3 mins of operation. I have changed the plug, filter, decarboned exhaust port, tried 87 with redmax oil, 87 with amsoil, 93 with amsoil. I would take it back to the dealer, but everytime I go there it runs perfect and I look like a fool. Anyone have any ideas as to what would cause this? After the thing spits sputters and dies 4-5 times it runs great.