high idle

2005 Element that has been sitting for several years (3-4) started and runs but after 15-30 seconds the idle goes from 800 to 3500 and stays there. Let run for 15 minutes and no change. Pedal will rev it higher but just drops back to 3500. Oil level is fine and looks good. Have run some seafoam...

I started the car up and it revved high, then as soon as I touched the gas the car almost stalled out. The I coasted down the driveway. I turned out and pressed the gas and the car almost stalled. As soon as I let off the gas it surged forward. I got the car back home. Later I took a look at...