115 fuel injected

[pls418111]

I've got a 2002 115 hp fuel injected outboard and it has become really cold blooded in the mornings unless I really warm it up. If I take off too soon the motors rpm's surge and then flatten out. After a couple minutes on the go she runs like a clock and will do so for the rest of the day even if it sits for a bunch of hours. But if she sits overnight she will do it again. I thought maybe it was losing prime so I tried pumping the bulb in the mornings but that doesn't work If it wasn't fuel injected I would think it was the choke not closing when it cooled off a lot. Any ideas what to look for? Thanks
Steve

[99yam40]

fuel pressures, filters, screens

Pressures will tell if something is plugging, but injectors have screens too

[pls418111]

Thanks for the reply. What has me baffled is that it only does it first thing in the morning. It can sit all day and later in the afternoon it runs fine, so it's only in the morning and only when it is cold. So I don't think it's a filter or screen plugging, possibly it loses pressure overnight. But I have tried pumping the bulb in the morning before and after I start it and for the first minute or two it will run bad and then great all day.