Not a mechanic or anything but maybe look at your spark plugs and fuel injectors. Did they use the right oil. Look at your starter as well.

I have a 2014 Altima SV 2.5L with 52000 miles, it's been a great car until the last week or so it has been stalling out when I'm either backing up or accelerating from a complete stop.  It is not throwing a check engine light, I just changed the oil/filter and air filter.  The air filter box is clear and the air intake hose looks clear also, but the problems didnt start until after I changed the oil and filter.  I doubt it was bad gas because the problem started when I got to 200 miles into a full tank which previously been empty.  Anyone else have a similar issue?

Need a little help if possible.