Dereck is not wrong the little tube they use for the air pressure has a tendancy to freeze and break! Be very careful with the routing of it so tha tit doesn't rub against something...
For the wiring, how many wires did you spliced into (the ones for the injectors)? 2 or 4 ?
Another think to keep at the back of your mind is the voltage regulator is known to sometimes be deficient on those sleds. If you plugged your box like stated in the instructions, there is a possibility that under bigger pulls your box is just not receiving enough electricity, Justin told me about this one and I by-passed it just to be sure and never had an issue.
Just giving you different thoughts here lol hoping to get you back on the snow asap!
btw you numbers are way off as you probably already know lol. 14.5 at idle is where it should be at. You set it with the fuel pressure regulator and hopefully you do not have to bring the pressure below 38 to achieve that. I would also wait for the sled to warm-up before adjusting idle as I found it affected the reading just a little bit...while cruising in the trail I believe the numbers were around 15 or 17? and at WOT 12.5 but I could be wrong on this one but it's in the instruction manuals.