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When I start my 150HP outboard it starts to idle at 600 RPM. It will then run up to 1000 RPM and back down to 400 RPM back up to 1000 RPM. It will continue to do this until it dies. It is not a consistent problem sometimes it starts and will idle at 700 RPM fine.
It's a 2004 Yamaha F150TXRC
It's a 2004 Yamaha F150TXRC