Car running fine one day, next morning starts fine but idles at 2,000 rpm and surges to 2,800 rpm. Just pulses from 2K up to 2.8K rpm continuously. If you kick it well above 3.5K rpm it still won't idle below 2K rpm and continues pulsating. Car has 130K miles was running fine. Nothing obvious going on with the throttle linkage.

Any suggestions would be appreciated!!