Sticky throtal (gas pedal)

The simplest thing to check would be check around your gas pedal. What you're looking for is carpet binding or impeding the pedal travel in some manner. I know, it's simple, but it's also the most common.

Secondly, follow the cable coming from the pedal and see it's binding in any way. It'll eventually pass through the firewall under the dash.

If still no luck, then pop the hood and check your cable coming through the firewall. Again you're looking for binding, or it rubbing against something.

If still no luck, check where the throttle cable attaches to the throttle body. It'll actually be what moves the throttle linkage. Have someone push the gas pedal and you see it. You'll probably have a cable coming from the transmission as well going to the same spot. That is, if it's an automatic...can't tell by description. A stick shift won't have a tranny cable.

If you cannot find any binding, then disconnect those cables one by one (easy to do..just carefully pry off the attached piece and then squeeze the large part where it passes through the holding bracket) and squirt a little lubricating oil like Liquid Wrench down each one. Try moving it back and forth and that should free it up.

Definately look at this soon. You do not want that pedal sticking! If it does, immediately shift to neutral and kill the engine. The brakes may not hold it if you leave it in gear. I had a Suburban do this once...and that was one scary ride!! I was only 16 too.

Hopefully this helps. If you do all this you should discover your culprit.