my vx ss idels at between 800-1500 rpm depending on its mood with the air cond on its 1500 then if it idels for a while it might drop to 1200 or on odd occasions is idels normaly. i have no idea wht it is. some sensor somewhere i'm sure. btw its a new second hand motor

broke a conrod in old one so had to take it out n put another in. i was thinking one of thoes sensors on the throttle body? but i'm not sre what they do. the problem seems 2 follow the throttle body tho 'm not sure.