I am new, 1992 PA 3800, runs great when cold, after turning off will not re-start. If left alone for an hour or so starts and runs fine. Pulled code 17 spark reference circuit?????

Welcome to AF! I assume with a code 17, that you do not have spark when it don't start. That would indicate the crank position sensor (CKPS) is not doing its job. You could also have a “failure to communicate” from the CKPS through the ignition control module (ICM). You need to check for spark when it will not start and if you have a tach or scanner, check for RPM. If no RPM is indicated, replace the CKPS first!:uhoh:

Replaced crank position sensor over the weekend, codes are gone, and runs great once again!!

Thanks AF