1997 Ford Probe

Engine Mechanical problem
1997 Ford Probe 6 cyl Front Wheel Drive Automatic 140000 miles

I had just changed the Timing belt along with the water pump the car started fine but when I test drove it, it couldnt get past 40 mph so I pulled over and then the engine jsut couldnt idle. I replaced the VAF sensor hoping maybe that was the problem but still the engine jerks and dies at high rpms it can stay a little stable but the car can not accelerate. Anybody have an idea of what it could be? Right now I thinkng maybe its not timed correctly. Please help thank you

(Ford Probe Gt 97' V6 FWD)
June 14, 2009.

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