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At the track we discovered a sticking secondary air-valve door on the Q-jet that delayed the opening of the secondaries. With a little minor surgery, we repaired the problem. The nearby screw (arrow 1) deforms the soft metal and catches the air-valve door. You can also see the secondary metering rod hanger in this photo (arrow 2) retained by a Torx head screw.
My Generation Camaro, Part III - 1987 Chevy Camaro Headers, Gears, and a Posi

At the track we discovered a sticking secondary air-valve door on the Q-jet that delayed the opening of the secondaries. With a little minor surgery, we repaired the problem. The nearby screw (arrow 1) deforms the soft metal and catches the air-valve door. You can also see the secondary metering rod hanger in this photo (arrow 2) retained by a Torx head screw.  View Related Article