Isx2250 tough to start

[benjiisx]

Hi all, didn't see anything in searches that matched my issue so I'm asking a new one.

I have a 2010 isx cm2250 that on the first startup of the day is tough to start. Will crank, catch, and run for a second or two and shut down. Does this 3-5 times before it will stay running.

I have monitored all the parameters via insite while starting and running and nothing catches my eye as to what could be the issue. I did a fuel leak down test, injector performance test, cylinder cutout. Nothing shows as wrong.

Once it has warmed up it has a slightly rough surging idle and jumps between 600 and 750rpms.

Any help would be appreciated as I have a pain in the ass driver in my shop every other morning with an attitude about it.

Also, no faults are present.