My question to all the Saturn heads is that my.

My question to all the saturn heads is that my car is having idle issues/bogging out when accelerating a bit fast. To be more detailed when I actually start my car from a cold start the idle jumps up to 2000 rpm and slowly goes down to about 900 rpms. Now another thing I notice is that when I put the car in drive it instantly takes off and I barely have to touch the gas. Another issue is that if im at a light and decide to accerlate a bit faster then usual to quickly get up to about 50
Mph the car feels like its bogging out and if I have to slow down the rpms lose power and drop to about 200 rpms and the only way for the car to regain power I have to hit the gas and I cant because I have to stop at a light or intersection. Any ideas you guys can help me out on? Electrical? Sensors?