Same happened to my wife when shopping, turned out to be the 4th gear clutch pack. They repaired it at the dealer and flushed automatic trans and refilled.
Until it's fixed just keep OD button out and stay off highway. It cost us under 400.00 with the 98.00 flush.
I am now having problrms with 2nd gear hitting hard and slipping in 3rd only when cold. 4th still works like a champ. I am taking it to the dealer tonight and will let you know more when I find out.
1993 Mitsubishi 3000GT Base OHC Automatic with OD
Wednesday, May 9th, 2007 AT 1:50 PM