Exskier

So I picked up a leftover 2011 Renegade XR in May and finally had the opporunity to use it today.  .4 miles on the odometer.  Dealer said it would be ready to go in the fall.  Just gas and go.  There was probably about a gallon of gas in it when i picked it up.  I started it a few times in the offseason to load and unload on the trailer.  I also added stabiler for that 1 gallon of gas.  so I made it about .3 miles (after letting it warm up for 6 minuts or so) it was running a bit rough but then started running nice and then immediately my check engine light came on and I went into limp mode.  I limped back to the trailer for a big .7 miles on the day and if I let off the gas the sled would die.  When i started the sled it would beep 3 times.  Any ideas??  Bad gas?  If so how do i fix it? I had added a gallon of 93 octane.  Do I need to drain it?  change plugs?   I think the dealers are on vacation all weekend and the snow is deep!  This is killing me!!!