All Plugs Fouling on Right Bank

Booster Dewey rebuilt the booster, I doubt that's it, but might be the white check valve. I'll tackle that end. And I did try adjusting the idle screws, set as the manual said at 1 1/2 turns out at first, then moved it with a vacuum gauge attached, but the adjustments made almost no difference ... Vacuum hardly changed and idle didn't change.