I have 2000 Elantra. After sitting approximately three hours engine will\nalways rev up to 3000 RPM and climbing. I always press lightly gas\npedal, increasing RPM even higher, forcing the engine computer to\n"reconsider" idling RPM. Normally, RPM is around 1500 and dropping to\n500 when warm.\nIt appears to me as a software bug. Is there any update for this?\nMechanics could not find anything wrong with the engine. (2L engine and\nmanual, no air or nothing). And it is hard to repeat as it needs exact\nsituation. If conditions are slightly different, everything is OK.