Name:   MartiniMan - Subject:   yamaha 150 4 stroke Date:   7/8/2019 1:06:44 PM

Not sure about outboards but I had the same problem with my inboard (Volvo Penta).  Turned out the fuel pump was bad.  The low pressure pump worked fine to make it start but the high pressure pump wasn't so it ran lousy and then crapped out when you put it in gear.  Installed a new fuel pump and it was back to normal.  I suppose I would start with the fuel filter first as maybe it's partially obstructed.