Hello, I have a Toro 22" Personal Pace self-propelled mower. The model number is 20332, and the S/N is 310043381. While I was cutting my grass today, the engine died. I was able to get it to start again; but when I pushed the handle in to engage the drive, the engine died. The engine runs fine and the blade turns as long as I don't push the handle in to engage the drive. Any ideas what the problem could be would be welcome. Thanks!