1989 150 V6 Yamaha stumbles and stalls

[snakedoctor]

"At idle engine has recently d

"At idle engine has recently developed a stumble, idle will bounce between 800 and 700 rpm. Stumble almost sounds like a stall and ignition is cutting out. Then will eventually stall. Manually put rpm at 900, still has stumble but does not stall. Does not seem to be fuel problem port engine idles fine.
Any suggestions"

 

[profisher]

Start by pulling each plug wir

Start by pulling each plug wire one at a time...your looking for the one that when pulled doesn't cause the engine to run even worse than it presently does.

 

[justintime]

i bet the carbs need a cleanin

i bet the carbs need a cleaning