Engine Performance problem
1996 Chevy Silverado V8 Four Wheel Drive Automatic 153377 miles
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My 96 vortec 350 is running poorly I have changed fuel pump, fuel filter, cap, rotor, plugs, wires, egr valve, maf sensor. My fuel pressure is ok @ 66 lbs.Here's the deal, my cam timing is running @ -11 degrees on the cam. Is this indicative of the engine needing a new cam chain and sprocket? I know the older engines had a fiber sprocket and we would replace them with a steel, double gear type. I Took the truck to a mechanic and he checked the fuel pressure for me and that's when he told me about the cam. He said that the cam timing should be 0-2 degrees negative or positive, either way. Please help. Thank you.