2000 Plymouth Neon

Engine Performance problem
2000 Plymouth Neon 4 cyl Front Wheel Drive Automatic 72000 miles

i have a 2000 neon and it seems that my car has a lack of power expecially up hills. Ive done a complete tune up and have changed the engine oil and transmission oil. Before I took a trip with the car the power issue came and went but after I went on the trip the car seem to just creep. After I got it home the engine was shakeing like a vibrating bed. And one other issue I was having is when the torque converter locks up I have a small jerking felling like the engine has a miss. After this trip the jerking has gotten worse. Any help would ver most helpful.
May 20, 2009.

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