1998 Ford Taurus

Engine Performance problem
1998 Ford Taurus 6 cyl Front Wheel Drive Automatic 85000 miles

I have a 1998 Taurus with 85000. Got error code P1120 and replaced the TPS. Now the transmission shifts hard between 1, 2 & 3rd and is dropping into overdrive at around 30 to 35 miles per hour. This is the third TPS I've put in this car and the frist time with the shifting problem. Any suggestions? Thanks.
October 27, 2008.

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