CHEVY 4.3L C1500 P0300

1999 Chevrolet Other

I have a 99 C1500 4.3L, 104K and it has a P0300 code. What's new, Coil, masair, plugs, cap, rotor, dist. Gear and new timing chain. What could be causing my misfire code? Has a lack of power and noise coming from the air cleaner. Need help and pin point test.
May 12, 2006.

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