90 percent of time no problem, but sometimes when i turn the key u hear the starter start to engage but will not spin motor. shiftng around the gear shift from park to d back to park or nutral. then i can get a start. we bypassed the nutral safety switch today and i changed the starter, and still have the same problem. i sure would like info on these models 1990 300e. is there a relay in the starting system or anything else. any ideas??? i m wondering if i have a bad spot on the flywheel ring teeth.