I recently purchased a 1988 Xplorer Model 228 and from one day to the next it would not start. The broker narrowed the initial problem down to a ground wire. Started fine the next day when I took ownership and drove it home. Two days later it would not start again, it turns over and is getting gas but will not start. I was wondering if perhaps this still may have something to do with the ground wire or something else. My son will be doing all the engine work provided I can locate an engine manual. Have the original owners manual but it does not go into the engine details. Anyoen have any suggestions as to where to start to look? For both??? 