was changing oil yesterday in my 6430. drained the oil, changed the filter and put plug back in. wife called me home with a problem. went back up later and changed the fuel filters. started it up and was going to grease the fittings. about 5 min. later it shut down. i about got sick to my stomach, never filled the oil up. wasn't knocking when it shut down, was like it ran out of fuel. filled the oil up, tried to get it started, it would turn over, but not start. finally spit and sputtered a couple times and finally started. sounds fine, no ticks or knocks. what would be my next option? never felt so stupid in my life. almost always pulled the keys- not this time. help. thought about an oil analysis. other ideas?