TQ secondary not opening up all the way

Kimmer,
You got it right in post #15. The huge sec throttle blades have a large directional effect on air flow/distribution into the intake. The MP bulletins recommended a 81* WOT angle for the secs on dual plane intakes & 88* on single plane. Pontiac engines used the QJ which have the same 2.25" sec blades; getting the WOT angle wrong can cause rear cyl to run lean.