I went to start my lawn tractor today and every time i came off the brake pedal the tractor would stale, just like when you come off the seat when not in park. After repeated attempts I was convinced I had a linkage problem. Just for kicks I check gas and noticed a few specks of white seat cushion. When I lowered the seat a few acorns fell out. I lifted and dropped the seat again and more fell out. I then realized that the acorns might be interfering with the seat sensor. Sure enough and keep lifting and lowering the seat and maybe 50 acorns had been stored in the seat. I started the tractor once again and no problem.