1993 Oldsmobile Achieva

Engine Performance problem
1993 Oldsmobile Achieva 6 cyl Front Wheel Drive Automatic 175000 miles

I just bought this car, a 1993 Olds Acieva SL 3.3L 6cyl, the otherday. It has a hesitation to it, when it is going from a stopped postion when the RPMs are below 1700. It only does this when in drive, reverse works fine. Any suggestions as to fix this? Or what might be causing this?

Things I have done/replaced already:
Spark Plugs and Wires
Fluids and Filters(Trans and Oil)
Fuel Filter
March 26, 2009.

Has the check engine light come on? Have you checked fuel pressure?