99 Stratus íhesitatingí

I have a 99 stratus that Iíve had for just over a year. Its got 97,000 miles on it. Its been running great up until last night. I was driving
about 40 mph, and then all of a sudden, the rpmís went down to 1000, it jerked a little bit, and then went back to normal. Then this morning, on my way to work, the rpmís never lessened, but I was going between 55 and 60, and it would just hesitate. Kinda felt like it was sputtering. I have a good warranty on it, so Im taking it to the dealer to get it checked. But I cant get in until Thursday. I was hoping someone had an idea of what the problem would be.
Any help is appreciated!
THanks :)
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