Car Accelerates On Its Own problems of the 1998 Ford Escort

The contact states the vehicle has a loud roar when idling. The vehicle also accelerates rapidly on its own. He took the vehicle to an independent garage. The technician suggested a new speed control and an idle control module. This was replaced twice but did not correct the problem. A diagnostic check did not detect any codes. The dealer was unable to determine the cause of this problem. There have been no further repairs at this time. Updated 12/27/2005 - this problem seemed worse in cold weather. In order for the vehicle to idle down the consumer had to turn the vehicle off then turn it back on. The problem would sometimes resurface a few minutes later, a few weeks later or a few months later.