Hey everyone...got a stock 2001 Tomos A35 at the beginning of the summer. Since then I put a 27 tooth front sprocket on, a unipod air filter, a tecno estoril exhaust, and upjetted to a 62. Overall it's running great and tops out about 40 mph on flat ground with pretty good accelaration. However, if i leave it idling for more than a minute or so the engine starts to slow down and sputters without giving it a little throttle twist...any ideas why that might be?? or what can I do to fix that?