My car is going crazy! 2 days ago I was riding and sudenly after 10 minutes I felt that the car got higher RPMs than usual. when i stopped at a red light the was at like 1100 rpms but it usually runs at about 700. i had to slam on the brakes to stop it. when i was ridin it aceelarated a lil more faster.

Later in my house when i switched to park it started to accel to 1800 and deaccelerate 1400, accel to1800 and deaccelerate 1400... like posesed by the devil. Can anyone help me?