My 1993 Subaru loyale just won't start sometimes. usually happens when parked on flat surface. automatic gears won't shift. wheel seems to lock then unlock. when i push the gear release...shift lever will move, but still won't start even in neutral. when i'm about ready to call a tow truck, then all of a sudden it starts on its own. been told it may be the linkage, then told maybe the neutral safety switch...but when its looked at it always starts then....been told it might have to completely leave me stranded before someone will know what this is.....help