I had a similar problem, my throttle body didn't close all the way. You may have to put on another spring from the throttle cable bracket to the throttle body. It's worth looking into. Strange thing about mine was that it was fine when the throttle body was cold, but when it heated up it would stick a little.

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1982 S-10 Wildside
355 TPI, Accel High-Flow Intake, Ported Plenum, Arizona Speed & Marine Runners, TPIS AFPR, Edelbrock BBK 52MM Throttle Body, 1993 Typhoon Drivetrain

 

I've got a POS re-bore 52mm from TPIS and it sticks at all positions but mostly near idle. Added an additional spring and it solved most of the problem.

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Mike

'90 IROC-Z, 5-speed, ZZ4, Trick Flows
Moderator SEThirdgen

 

Yep, I had to do the same thing with my TPIS 52mm TB. Since I dont have the TV cable with my manual trans, I put a spring on that spot on the TB, and to the throttle linkage on the side of the plenum. It works great.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
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Webmaster: SoCal F-Bodies