I can crank and run the mower without issue. I have bypassed the seat switch. I can drive the mower anywhere, I can even engage the blades. But once I engage the blades, within 20 to 30 seconds of mowing, the engine dies. I can crank immediately, with backfire, and cut another 15 seconds or so, then same thing, the mower dies. So it's not the engaging of the blade that kills it, it's only after I've cut a half-strip across my yard. Is there a sensor or cable causing the issue?? I'm at a loss at this point. Mower hasn't run in more than 8 years, so I just cleaned and replaced all gaskets/ filter/ pump. Any help/ suggestion is much appreciated.