Afew things can be done .Look in to youtube videos for fuel distributor clean . Means spliting it open and cleaning the valve. Will your car have a potentiometer on the side of the throttle body .If so it wears out ,as the carbon tracking piece inside..wears out as the lever travels across it . That to will be on the tube.. The throttle body can be the problem but not an easy fix it as to be re built . Inside it as this steper motor that opens and closes the throttle flap..