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you may have to check the fuel pump function for pressure and volume when this happens as it could be a bad pump,you could have it checked when working as it could show up something but more likely should be done when it stops running.
You can go to most any autoparts store and have the codes scanned too for free that may give you codes to help point you to the right direction right away. Try checking your distributer cap and wires. You can check for continuity with a volt meter for your wires and then look under the dis. cap for any posible corrosion. Another thing is to pull that plug of the cylinders that are not firing (should be the ones that when you pull the spark plug wire no change to engine RPM is noted) see if they are black/white. Black means too much gas(rich) and white is not enough gas (lean).
the code you have is for a misfire on #3 cylinder. (im sure you knew this right?). the crankshaft position sensor will not cause one individual cylinder to misfire. what i typicaly do in this scenario is switch the ignition wire off of the guilty cylinder onto a known good firing cylinder and see if misfire moves to the other cylinder. i repeat this process by switching the spark plug and finaly the fuel injector. a compression check may be in order as well (but not a likely cause) unless you have access to a tech 2 (gms diag computer) you will need to clear this code after each component is moved and see if you get a new code ie :p0304 if switched to #4 cylinder..other wise if you do have access to a computer that has a misfire chart in its features you can quickly identify the guilty component. as i side note the ignition coil may also be faulty, but i believe your vehicle has a 3.8liter meaning that it has a coil pack....switch the others i listed and see ow you make out....good luck!
did u test the fuel pressure before u installed the pump? it is more likely the crankshaft position sensor on the engine is defective, run a trouble code test and see if u have any codes for thei sensor. Go to this web site to read how to run a trouble code test.
Have you chg.fuel filter and had a fuel pressure test done? Does it have spark after it stalls? Fuel pumps are a common problem, they work when cold get warmed up they quit, after a while quit all together. Do the fuel pressure test.