I have a 2000 Johnson 115 hp ocean pro. Recently it has started giving me problems while idling. It usually idles at about 1000 rpms but now wants to idle at only 500 rpms and stalls unless the throttle is increased in cold start position. I have replaced all the 4 spark plugs and the water separator filter, with no improvement. Motor feels cool and is peeing well, good water pressure on gauge. Does anyone have any idea what else could be causing this? Thanks.
