I was just given a 1995 craftsman Lawn Tractor, 46" mower, 6-speed transaxle, Model #917.272010, with a Kohler 16.5HP engine.  The engine operates strong and smooth.  However, when I let off of the brake pedal the engine shuts off just like I had turned off the ignition switch.  Also, if I pull out the mower deck switch to turn on the blades, the engine will cut off.  I was told that it worked fine until it was parked 1-1/2 years ago when the owner purchased a new mower.  I've been told to bypass the seat safety switch, which I did, but that did not change the issue.  I see in the manual that there is a "operator presence relay" and an "interlock switch".  Has anyone seen or heard of a fix for this issue?  Any insight would be appreciated.  Thanks!  Cody