I have a 36" Scag walk behind, Kohler 12.5, manual start, electric pto. The PTO clutch died and I replaced it, after that it worked fine... after about an hour of use now when I engage the PTO it stalls the engine. It is killing the engine spark, not drag. I have tried the operator presence jumping and disconnecting and no different. I did a search and saw someone with similar problem replaced the PTO switch and it fixed it. I am hoping that will do it. Anyone else have ideas or same thing happen?