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1996 gmc sierra 1500 sle 5.7 keeps throwing code p0300 have replaced plugs , wires , distributor , cap , rotor , coil, truck starts fine then dies at idle .

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Location: Oregon
three very common things that can cause a P0300 are:
1. cam retard - check with a scanner (spec is 0 +or- 2)
2. vacuum leak from intake (could be internal leak into crankcase)
3. fuel injector bad or dirty, fuel pressure, fuel regulator, fuel supply leak in intake (check fuel pressure 60-66psi), (do an injector cleaning service), (check for raw fuel in intake)

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