Why would it all of a sudden start short shifting and shifting very hard? on 2004 Mitsubishi Endeavor

All of a suddend it felt as though there was a very hard and sudden shift while getting on the highway. Right after that, the Have Engine Serviced Soon light came on. Now, it shifts really fast, too early, and the idle has increased quite a bit, in park around 1200 rpms'.

by in Lincolnshire, IL on March 19, 2010
3 answers
ANSWER by on July 29, 2010
Okay, let me warn you - our light didn't even come on but we noticed some of the same issues on our 2005 this last week, it started bucking (was hard to drive forward) so my son parked on the side of the road and we towed it to our mechanic. Guess what, at only 91K miles,the transmission is shot. Mechanic said it will be 2100 - 3000 bucks to fix. No warning other than the hard to drive issues the same day we had it towed... see your mechanic NOW!
ANSWER by on September 19, 2010
vacuum leak on trans valve
ANSWER by on October 19, 2010
There was a recall on the shift gear... Maybe this will help...