M6 2006 wants to stall out
 

Ok so need HELP.. have a 2006 Mazda m6 that is my son's car.. I borrowed it on fri to take my sister in law to MCI airport 40 mins from my place on the way got 15 bucks in car ran 70 maybe 75 hwy to airport and home no issues!
next day my son went to drive it but however with in 2 blocks car started loosing power, cutting out then dies on him!
could this be from bad gas! Had part store run codes and the are Telling me is a bad coil that needs replaced for 75 bucks WTF makes no sense to me how is ran perfect!
I think it's bad gas please help

What fault code are they giving?

P0301 is cylinder 1 misfire
P0302 is cylinder 2 misfire
P0303 is cylinder 3 misfire
P0304 is cylinder 4 misfire