Dude! I have the same problem with my 93, couldnt find anything on this issue, I took it to a tranny shop and they said it was the bushings on the shifter arm connecting to the tranny and that it puts the car in limp mode because it isnt sure what gear to be in, I havent researched anything else on it but I did replace the bushings and it stopped doing it for a week but its back again. I have also replaced the neutral safety switch and still is there. Also mine in intermitten and only does it about 20% of the time and ONLY coming from park to D