I have just finished rebuilding my 1991 40 hp johnson. I replaced the VRO with a new standard fuel pump. The motor runs pretty good except at idle. is there any adjustment I can play with to make it run better at idle without using the very expensive test wheel which I do not have. By the way, I forgot to mention I have rebuilt the carbs and set all carb and linkage settings up to the defaults listed in the clymer manual. float level, turns for needle valve for low speed, length of 2 linkages, position of adj arms in relationship to each other, carbs opening and closing the same amount at the same time, etc.