The throttle has a small creep right in the cruise range. If we want to hold at 3800 RPM, it will slowly fall to 4000 RPM. I looked into the Teleflex CH2200ENC throttle manual and it mentions a throttle brake, but I can't find the adjustment screw. Do you remove the chrome bezel and handle? I can't match the location they reference in the diagram on page 2, top right corner.
http://www.marineengine.com/products/technical_information/CH200ENC_side_mount.pdf