2001 Volkswagen Jetta

Transmission problem
2001 Volkswagen Jetta 6 cyl Front Wheel Drive Automatic 80000 miles

I have an 01 Jetta VR6 with automatic transmission and just recently my acceleration dropped dramatically. When I floor it it feels like it is stuck in 3rd gear and slowly picks up speed without shifting gears at all. It won't shift to 4th gear at all so I have to limit my speed as well. If I choose to put it into 1st it accelerates fine, then I can shift to 2nd and then drive but it still won't go to fourth. I have decided to let my car sit and just use my other but its an Expedition and is killing me on gas. How can I check the transmission fluid? What do you think could be the issue? Is it an easy fix? If so, what can I do? Thanks for your time.
September 11, 2008.

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