I am wondering what wrong with my vr6,everytimes i switch on the air con. the idling will drop to 250rpm and up to 600rpm again for few times if i rev the engine to 3000rpm and release the gas padel same problem the idling won't be stable but if i switch off the air con day and night different the idling rock steady at 650rpm,i already service the isv ,thorttlebody and air mass sensor same problem why?Please assist? Thank You.
