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P0300 on 2003 Chevrolet Blazer

  

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Dear Scotty, I have a 2003 Chevrolet Blazer LS 4x4 with over 200k.It recently was suffering from an intermittent crank no start. I found a bad ground wire at the back of the head, but now there's a random misfire at higer rpms, over 35 to 45 mph. Fuel pump,filter, injection spider, ignition module, coil, distributor, wires and spark plugs have all been changed. Am i looking at the pcm or could reprogramming help. Please help


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