just to be more specific. it wasnt the usual hummuing sound that the mooose makes. it was more of a puff of air sound right before the engine would rev. it was weird becase I wouls hit the gas and the engine sounded like it was gasping for air , and then a second later would finally rev. There was defintitley a delay in the time i hit the gas to the time the engine would rev. Does'nt seem normal. Has anyone experienced this?