Hi all.<br />Should there a wiz outthere who can give me a hint.<br />I own a 1994 90HP 3 cYl MERC in very good condition. However it idles very bad. Spits and "shakes" like if the sparks misfires. Have tried: New sparks, Carbs cleaned/adjusted, new filter, tank cleaned etc etc. It has good compression and runs great at speed....but it will not take 5500 rpm anymore. Only ´bout 4700.... I have "read" the plugs after a good full run and they look fine.<br />Any suggetions ???? 