NHTSA Complaint #11536335 — 2009 HYUNDAI ELANTRA

Drove about 1 hour using cruise control part of the time. Don't usually use it, but used it 2 months ago with no problem. After 1.5 hour visit, drove home. Did not use cruise control, but at last 10 minutes acceleration issue started where car would "rev" even though I was not accelerating. Able to manage it with brake and normal driving. Tried to reset cruise (turn on/off), but car still had episodes of "revving". Did not accelerate to dangerous level and controllable. After car sat in garage for 2 hours, I drove out of neighborhood to empty stretch of road and accelerated to 50 with no problems and no revving of engine. Service check scheduled.