RN 760 runs well for a couple minutes and then bogs and dies, but will fire right up again and run for another little bit, just like if it had an exhaust leak. I opened the hood and there was a moderate amount of smoke in the bay, and also some 2stk oil in the bottom. I pumped it out and tried again, and the exact same things happened. I looked for a leak and didnt find one, is there something that I am maybe not thinking of, or should i just recheck for a leak?