If you changed the Fuel Pump (I did also), since is starting well but shuting down right
after, it could be the FUEL PRESSURE REGULATOR ( I also changed it -very easy to do
it yourself and cheap part).
I bought a can of STARTING FLUID that will help you get your car running (follow the
instructions in the can or find a YouTube video, it's very easy to do ), to do the following
step.
I would also see if the fuel injectors are clogged, but before you change them try cleaning
them; (they are about $25 dollars each and could be hard to change depending on your
engine) I cleaned mine adding GUMOUT to a full tank of gasoline, let the car run and drive
it around your neighborhood in case it shuts down by itself again, reason why I let mine
run for a few hours in front of my house with perfect results, now it starts perfectly and runs
very smooth.
I would check the SPARK PLUGS; if you need to change them make sure they are the
best, I prefer Titanium, which are about $7 dollars each but worth the expense; BUT, make
sure they have the right gap, for my 1992 New Yorker, the gap is 0.050 (buy the measuring
wheel tool is only 94 cents in Walmart..
I use ROCKAUTO.com to order all my parts, they are half the price of Advance and the
other "regular" auto parts.
See SCOTTY KILMER" in YouTube, he has a channel end teaches how to do all of the
above with good video and sound, he is excellent.
Be patient, do one thing at the time.