Funky Key

Well, I got in my car one day, and the ignition key was locked, so I turn the steering wheel to get it unlocked. I start the car just fine and get to my destination just fine, but when I go to turn off the car, the key doesn't engage the 'ON' or 'ACC' position! It engages in the 'OFF' position, but then it doesn't do anything. So now I have to turn off the car by disconnecting a vacuum line and disconnect the battery. I replaced the key lock cylinder to no avail. I can't seem to find the problem, and my Haynes manual on the car seems to give no info on that part of the ignition. Please help!

What year is your Taurus, and does it have the column or console shift lever?

-Rod

It is a 1992 taurus gl 3.8L. It has a column shifter