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I can't see how the line is the problem it is a filter side breather there is a slight vacuum at high intake flow in front of the throttle body. If cracked, it can cause low speed stumble as it will leak air into the already metered air (post MAF). I have a LT1 but the system is similar.
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Forged short block, large duration sub .600 lift Cam Motion cam, 7200 RPM fuel cut, Pray Ported Heads, 3.85 pulley D1X, stage II intercooler, DSX secondary low side, DSX E85 sensor, Lingenfelter big bore 2.0 pump, ported front cats, 60608 Borla, LT4 injectors, ZL1 1LE driveshaft and Katech ported TB, ported MSD intake, BTR valvetrain, ARP studs, ProFlow valves, PS4 tires.
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