Chevy blazer won't start?

95 chevy blazer, v6 vortec 4.3 4door
4Wd

Alright so we are at a loss here and
we have had all our friends who re
mechanics come out and try to fix it
and no dice.
It started day 1 with a rough idle, but
then it was fine once you got going.
Day 2 it was not only idling rough but
it was having trouble accelerating.
(Sputtering) Day 3 every time you let
off the gas it stalls and won't start
unless you spray starting fluid in it,
but then it dies immediately. I don't
want to keep doing that because I
don't want to blow the intake. We
replaced the distributor cap and the
map sensor. It has fuel and great
pressure, and it has good spark.  help
Please