Pontiac Sunfire 1999 Major Problem?

[Francine V]

I have a pontiac sunfire 1999 two door, not gt or anything. It generally rests at 600 RPMs and sticks around 1200-2500 RPMs while I'm driving. However, over the past year I began to notice a small problem. Occasionally when I put my foot on the gas pedal from a stopped position, the RPM meter will rise, but the car won't go. Generally I took my foot off a quick second and accelerated again and the car moved just fine. However, in the past two weeks,the car has been getting significantly worse, and after 45 minutes of driving in a day will lurch when I'm decelerating, randomly jump up to 4000 RPMs while I'm coasting and put my foot on the accelerator a little bit to maintain speed, and also occasionally fizzle out when I go to accelerate from a stopped position. Any help would be greatly appreciated.

 

[99Green GTP]

sounds like a problem with the clutches in the transmission. automatic i'm assuming? a new transmission ould remedy the problem, i had this on my old 99 cavalier and fixed it putting the transmission in. send me a message and i can help you a bit more, is it a 3 spd or 4 spd with overdrive. more simply put, does the gear indicator say 1-2-D-N-R-P or 1-2-3-D -R-P?