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18 The closed crankcase ventilation hose is reconnected. Before starting the engine, turn the throttle body setscrew so there is a .010-inch gap between the throttle stop and screw. Double-check the installation for security, then start the engine. Allow the ECM time to get acquainted with the BBK/PRO-M improvements. If idle speed is too high or too low, check the throttle to setscrew gap again.