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    Idle drops on Isuzu truck mount

    I have a 2006 Isuzu NPR box (diesel) with a White Magic Pro 1200HV. When the mount is engaged it will rev the truck up to about 1500-1800 RPM and all will appear ok but it will eventually drop the engine back down to a normal idle of about 700-800 RPM. The mount will remain engaged but the...