it is hard to say exactly what your issue is with the info you gave us, it could be as simple as your low speed screw setting but you are going to have to do some calibration checks, you say it runs fine otherwise....so the only time you had a issue was loading it on the trailer? is it because you just spent a lot of time idling up a no wake zone? if your low speed screw is out too far and you just ran at an idle for a long time it could be loaded up on fuel. you need to do some plug checks, if your plugs look good at all throttle positions other than at idle then try adjusting your low speed screw, but if you find the plugs look rich at all throttle positions then you could have your pop off pressure set wrong, hard to start after sitting for 10 mins could be because of a leaking needle and seat or because of the previous adjustments also among other things.