1997 Blazer, odd acceleration. PLEASE HELP!

[Wet Sand 12]

I have a 97 Chevrolet Blazer. Today on the Way home from School, the car went "psycho" on me. As i was normaly driving down the road, the car accelerates and decellerates (sp?) without me doing anything. It was as if i was rapidly stomping on and off the gas peddle.

Any ideas as to what happened? How/How much to fix it?

Thanks for all the help!

[BlazerLT]

Is the check engine light on?

[Mikado14]

Either the engine was loping or you were tapping your foot to the music, your right foot.

As LT said, any engine light's on?

When was the last time a complete tune-up was done?

[Fireplug]

Was it in auto pilot mode???