I just brought a New engine but When I pedal trying to start & engage the engine, it starts & jumps very low & shuts off when I stop pedaling. it did rain here so idk if it got in my gas can & could be the problem. now if I try to engage the engine it won't start at all. im scared that water might be in my engine from the carb from me filling my gas tank from my gas can from the rain. I checked the spark plug I see spark, any help?