2006-2010 Suzuki DF150 / DF175 4-Stroke Outboards Service Manual, Page 137Get this manual
ENGINE CONTROL SYSTEM
CHART 20: UNSTABLE IDLINGTROLLING (OR ENGINE TENDS TO STALL)
Before starting this troubleshooting, make sure that: There is no self-diagnostic code indication
START Ignition switch "ON" Check shift position sensor output voltage change(See page 3-60 Is result OK? YES Ignition switch "ON" Check throttle position sensor output voltage change(See page 3-59 Is result OK? YES