i have a problem with my engine, it doesn´t seem to be idling right; wants to sputter some and backfire a little; it has new plugs, new fuel filter, jets on the carb were cleaned, and i use premium fuel only as recommeded by dealer rep i purchased it from; now im not a mechanic, so i may show my ignorance but first does it have an electronic ignition box? if yes could that be it; if not then any ideas?