Hi... I have a 1992 mariner 100 hp 4 4cyl, I rebuilt the carburators, new trigger, stator,cdi, regulator, in low iddle the 3 and 4 not working , have a new spark plug and all 4cyl have strong, spark but in adle engine hesitade... This did engine use only 1 and 2 in low iddle or suppose all 4cyl...