Idle tend to go high on my -98 lt, ca. 12-1500 rev / min. Having followed a little extra with lately and it comes after the engine warms up and I've run a few km., And so it seems that it goes down to normal speed when the vehicle then remains stationary / speedometer of 0. Have noticed for a long time now and the problem seems to come when outside temp is between about -7 deg. C and +5 deg. C. Otherwise, it starts okay and running normally, no cheating, etc. Throttle body ,mass air flow sensor, idling engine is cleaned, tps "clicking" and ect sensor, rear abs sensor is replaced with new ones. The car has undergone 330000 km.

Hope there is someone on this forum who can give me some info to solve this irritating issue.