Went out this morning and my 99 Yukon SLT with the 5.7 vortec won't start. It acts as if it's starving for fuel. It'll run for about 5 seconds and then surges and dies. I tested the fuel pressure, it remains a constant 60psi. I'm assuming the spark is ok since it'll fire for a few seconds. I'm breathing, so it's getting air. Not sure where to go from here. Any suggestions? Oh and there are no trouble codes or flashing lights on the dash.