Blazer has spark and fuel but won't start ?

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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