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Couldn't you just pull one of the vac lines off the TB and check if there's either vac or no vac (equilibrium) at idle. If the thing really has 5psi of pressure at idle you'd feel noticeble air coming out.
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'98 T-Top Firebird: L67 shortblock, Intense Racing: Stage 3 heads + Stage 3 Turbo Cam + lightweight pushrods, Yella Terra 1.7 RRs,PT GT 6152E , RK Sport Headers, Spearco 28x17x3 FMIC, Bosch 42.5lbs, Walbro 255, Motive 3.73 gears, Huges 3200 stall, Koni/Spohn suspension, and an extra ~400lbs of the "boom-boom-thud" stuff.
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