2003 Hyundai Santa Fe LX Issues

I would suggest changing the fuel filter, and if that doesn't help, have the fuel pressure tested. and it sounds like maybe the switch to your sunroof is bad.

The start & run problem could also be caused by a bad valve in the emissions controls, under the truck. There is a check valve that can act up and cause this. I would agree with the first answer as a good starting place for correcting this, but even before that check the car for any stored trouble codes in memory to see if there is a cause listed there, it's easy and free to do at an auto parts store. If none are found, start with the filter since they are rarely changed anywhere as often as they should be.