1991 Nissan Stanza

Engine Mechanical problem
1991 Nissan Stanza Automatic 129000 miles

I bought the car a week ago and had it checked out and it was fine. 2 days later, I was driving, slowed down to turn, and when I went to accelerate, there was no response when I pushed on the pedal. I have to have the pedal down to the floorboards in order to accelerate the car now, it seems to have less get-up-and-go than it did, but other than that it still accelerates and shifts smoothly, and I can get up to highway speeds, but slower than before. Any ideas on what it could be? Thanks
May 28, 2009.

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