I have a 2004 TL with about 63,000 on the clock.
For the last 2 - 3 months the car has felt very sluggish especially on acceleration, it just doesn't have the punch it used too.

The transmission was replaced at 33,000 miles and I keep up will all the maintenance, (air filter, oil changes ...) and only use hi test gas.

Is there any suggestions as to what I can do to get the performance back?

 

seafoam or take the cable off the battery for a few mins to reset the computer....but itll get back to being "sluggish" in about 100 miles it just adjusts to the way u drive.