Do you have a manual or auto? Doubt the tranny is the problem, but if your acceleration is poor because the gears aren't shifting on an automatic, it could be a possibility.
I was thinking Throttle Position Sensor the whole time reading your description, but you mentioned you replaced it... when you lower the gas, does the engine rev up higher and higher but your speed remains constant until it's Full Open Throttle? or do your RPMs remain low until you get FOT and then you also get acceleration? If your rpms climb but the car doesn't accelerate, I'd be willing to blame the transmission.. if you don't build any rpms until you're FOT, then it could be the throttle position sensor still (could have been installed incorrectly?) or probably something in the fuel system... either the injectors or filter are clogged up... when you push the pedal down enough, you're pushing enough gas to get past the clog... but not until then..
Dunno, kinda shootin darts in the dark... I'm a computer guy, not a mechanic... but knowing how the systems work (in generalized detail) has drawn me to these conclusions... if someone more mechanically enclined has other advice, I'd strongly suggest taking theirs over mine.
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