The boost freq. valve sites down below the intake tubing and can be accessed easily with the airbox removed. When I was having my issues (Blown MAFS was original culprit) I redid all the boost hoses and addressed the vacuum lines to the boost freq. valve. Wish we'd have taken the time to put my Durametric on it while you were at the shop on Saturday...

Check all those hoses...

Mike

 

Of course I didnt get problems untill the way home! I had them read yesterday and there was nothing. I will go through it when I get back in town.