... will lead to brake failure.Debug method:1, For carburetor car series:(1) Remove the Heat sealing mat between ... and engine, or on the PCV valve.2, for EFI car series:(1) Find the intake manifold vacuum closest ... the idling speed will increase.4, Observe speed meter, adjust the inside screw of the fuel saver to ... speed to increase or decrease.3, Observe speed meter, adjust the inside screw of the saver to ...