My Revo engine is about 3 years old. I don't use it that much maybe 2 gallons of gas run through it. I don't think more than that. Lately I have been having an issue with tuning. When I gun it, the engine bogs down and shuts off. I have tried to tune the needle and every time I think I have it, the same issue comes back. Weather has been a bit humid which I am sure does not help but my question is, is the motor worn out or do I just need to tune better. If it is worn out is there a way to repair it or is it better to just send it in for a new one? The motor has not been abused- Having said that I often do not do the after run procedure. Thoughts?