i have an 04 a8l i removed the front cover (4.2) from enjgine, it just lifts off, i noticed there are two vacuum actuators which hook into the intake. as i read this is to operate the two stage intake, supplying more torque throughout power ranges, my problem is this, the plastic linkages that clip on to the intake are broken ! common problem? any idea where to purchase such pieces? thanx !!!