whats wrong now ????? can't put it back in park
 

88 300e after driving a while when i stop to put it in park, I can not get the shifter to move, it stops in reverse. I turn the car off and wait 5 sec. then somtime it will just shift like nothing was wrong Please help............

The governor pressure isn't bleeding off as designed. When you aren't moving the governor pressure should be "0"psi & the reverse lock-out piston should return allowing the gearshifter to go back to park. YOU have a valve body problem in the trans!