I've got a 99larson with 4.3gl it got hot once and then didn't want to start or crank for that matter. used some starting fluid and got it to start and put in trailer then got it home and same outcome. When it did start and run I had good oil pressure and water temp but now that its at home it seems to have a knock at low rpm. sounds better at higher rpms. I changed plugs and cranked motor a couple times. Got some fluid out. Not sure if water or fuel. kinda smelled like fuel but not real strong. Any thoughts? Thx