Car keeps dying

So I have had this car for a little over a year now
and the whole time that I've had it it's had this
problem where it either dies or driving dies while
it's been parked so wont turn on or just won't turn
on. Last year I put a new starter in it put a new
battery this year I've changed the alternator matter
of fact I changed the alternator about last week
and it was driving good but about the middle of the
week after I have changed it it started wanted to
die on me except this time it's different battery
light comes on a little fuel light comes on in the
little ABS emergency light comes on but it won't
like die completely so I can keep driving it and
sometimes I keep going and it'll go back to normal
but other times I'll keep going stop turn it off and it
won't turn back on other times stop turn it off wait
a little bit and will turn back on. Well the last time I
happened it was dying on me kept driving and it
went back to normal. Went home turned it off and
when I tried turning it back on it did not want to
turn on and now it's just been like that for a couple
days just sitting there. Please help me I do not
know what to do anymore with this car I feel like
I've done just about everything and it keeps doing
the same thing it's been doing the whole 16
months I've had it. Oh it is a flex fuel also