crackling sound was heard coming from right wheel,thought was the velocity joint, had it replaced, but the crackling sound continued? what else could be the problem?
In idle, rpm oscillates a little; No codes presents. Many mechanics say me that the car is Old because to this it always oscillates.
In general when the rpm oscillates it is an indication of a vacuum leak. This can be from an external vacuum leak such as a crack in a hose. Or it can be from an internal vacuum leak inside the Idle Air Control Valve (Idle Speed Control).