I have a 2003 lb7 ran great when I first got it 161000 miles except sometimes the starter grinds no teeth are missing on the flywheel and I put a new starter on still does it. Then it at times would start right up and sometimes it wouldn't if I let it set for an hour or sometimes all night it was totally random but it would start right up without doing anything to it it runs great when it does never just died just won't start sometimes so I have replaced the FPR the cam shaft position sensor put a solid race valve in the ignition switch and key lock tumbler put the cat conversation filter on and the airdog 150 on still does the same thing after I did all that it started right up ran for 5 min shut off it has started and shut down 3 times all at way different times sometimes it will run for 20 min or sometimes for 5 min and sometimes after 2 or 3 seconds of cranking it will stop and sometimes it will crank for 30 seconds everything is just so random please help thank you