Ok, I have a 1969 snapper rear engine that was bought new in the family and babied like you wouldn't believe. the last few years, however, it has been giving me problems. simple to describe: I start the mower with the pull-string. Starts on the 2nd pull every time. if I put it in gear, i can ride around all day in any gear - no problem. Take it out of gear and engage the deck (blade) and it spins, no problem. BUT.....if I put BOTH loads on the engine, it sputters and dies within 10 mins. It just can't handle both loads at once. Tried new plugs, plug wires, he said there was a "new" style of something or other (ignition?) and replaced it with the new kind, all to no avail. Just will not take both loads at once. Ideas??