I finally found a machine shop that will rebore my N8 throttle body, w/no problem. Shop has been doing custom throttle body work for nines years out in California.
He has assured me he has never had a PCM problem with any GM cable driven TB and I'm going to send him mine. Seems real straightforward and seems to now TB'*. Even told me not to buy a powerplate spacer from him stating my plenum is already more than adequate and they found no improvement in port style injection.
He is going to CNC me a spacer plate with nitrous jet hole drilled and tapped, saving me from drilling TB body. $125.The rebore includes: boring, custom fit CAD designed throttle blades, reducing shaft profile, installing button head screws, milling topside and tumble polishing $227 & $8.95 Shipping. I not endorsing him yet but will post pics when I get it back and details when She'* back together. dizzyJohn