I bought a used lazer model lz27lka604 ser. 332144 and it ran fine until today. Went to start it nothing, would not turn over. Turned key on and jumped wire to starter selinoid and it started, but when I enguaged clutch it it acted wierd. So I replaced pto switch , now it starts but when I release the brake or pull stearing levers in it dies. If I take off the kill relay I can run it fine but shuts off because of no fuel. Why does it keep dying, can I bypass the safty switches? The mower came with the seat switch bypassed.