Chevrolet Repair: car wont stay running, fuel pump relay, residual pressure

Question
my 99 lesabre died and wouldnt restart i checked fuel pump and was working well. replaced fuel pump relay and fuel filter.cleaned maf sensor cleaned egr valve checked tps car starts but dies within 10 seconds not sure what else it could be.

Answer
HI PHIL,WELL FIRST THINGS FIRST,HOW DO YOU KNOW THE FUEL PUMP IS WORKING CORRECT ??? WHEN THIS DIES IS THERE FUEL TO THE FUEL RAIL ??? LIKE LOW PRESSURE FROM FUEL PUMP.LIKE [RESIDUAL PRESSURE] THIS WILL FOOL YOU ALL THE TIME. FOR A FAST TEST JUST BEFORE IT DIES SPRAY SOME STARTING FLUID INTO THE INTAKE CHAMBER,IF IT CONTINUES TO RUN THIS IS LOW FUEL PRESSURE. HAVE A GAUGE ?? SHOULD HAVE AROUND 35 LBS# IF IT IS LOW YOU HAVE A BAD FUEL PUMP..VERY COMMON. [REMEMBER, WE NEED PRESSURE AND VOLUME] NEXT THING TO CK IF YOU ARE SURE THERE IS FUEL TO THE RAIL,CK INJECTOR PULSE,YOU CAN USE A LIGHT BULB #194 BEND THE TABS STRAIGHT OUT AND STICK THEM IN ONE OF THE INJECTOR HARNESS PLUGS,WHEN ENG IS RUNNING THIS LIGHT SHOULD FLASH, NO FLASH WHEN STALLING COMPUTER IS BAD OR WIRING ISSUES.. MY MONEY IS ON THE FUEL PUMP.  GET BACK TO ME ON THIS. PLEASE WHEN LEAVING THIS SITE COULD YOU RATE THIS ANS,THIS WILL HELP ME..TOM..