1996 GMC Sierra engine stalls at start up

1996 GMC SIERRA
100,000 MILES • V8 • 4WD • AUTOMATIC
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GMCSIERRA
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My engine will start will no problems if I allow the fuel pump come up to pressure first, and runs fine until I reach 60 mph. It feels and sounds as if it is down shifting, at lower speeds it runs fine.
If I crank the engine to start without allowing the fuel to come up to pressure, it willl act like it has air in the fuel line or starving for air for a short time, it either dies or smooths out with time.

trouble codes- p0102 p0340

Parts that I have changed so far:
plugs, wires, cap, cam shaft position sensor, fuel filter, fuel pressure regulator, fuel pump

Does the computer require recalibration?
Jul 17, 2010 at 9:18 PM
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