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Am I missing something? Three 10 mm nuts - one on each side bolted to the rubber mounted studs, and a third under the rear of the "gravy boat" at the bottom of the "V" in the engine. I can't get the throttle body out - almost feels like a 4th nut and bolt somewhere.
throttle body, on Ljet and Kjet, 4 nuts fasten it to the lower plenum. Three fasten the plenum to the block.
Easier to remove the throttle body separately. Then the plenum (gravy boat?).
Any other system, I don’t know.