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Changed fuel pump.filter.ignition mod.and crank sensor.starts but stay running

(1991 Buick Century)
in Flushing, MI on September 25, 2013
the car starts but will only run about 10 seconds then dies.replaced fuel pump and filter.i have 32-34 lbs pressure running and 42-44 not.replaced ignition mod still same thing..towed it to gm dealer for diagnostic and their suggestion was crank sensor so i replaced that also with no change.spray ether direct into throttle boby and motor will keep running.no codes on computer...im stumped on this
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