Thanks for the ideas. The shifter is hard to move from park but that is due to a sticking shift cable. Once it moves from park, it moves freely from reverse to D2. The solenoid seems fine. Today on the way home from work the "S" light blinked intermittently and the tranny would shift from 4th to 3rd and stay there. It would only go back into 4th after stopping at a light and starting again. I went out tonight to see if I could get a code from the TCM/ECU. This is what it spit out:

Check Engine light = code 15
"S" shift light for tranny = code 12 or 21 (depending on which you look at it)

Does anyone know the tranny controller codes for a 90 LX auto? I checked my books but could only find standard ECU codes such as 15 = ignition output signal.