Well that's a good one. I'd also be tempted to reinstall the stock covers, but I sure would be curious as to the effect on the PVC flow.
PCV valve blocked by contact with the baffle? Check for vacuum at the Breather opening on the opposite valve cover? A slip of paper should be gently drawn onto the opening by vacuum.
I just went through an Idle situation on my TBI 318 '88 B250 Had to learn a lot and read up on that part.
Maybe a shorter valve body on the PVC if so ? Could be that easy.
Good Wrenching and Van On 318's!
Last edited by Wedgy; July 19th 2018 1:19 pm. Reason: fixins