Question about 2001 Chevrolet Silverado

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I have a 2001 chevy blazer with the 4.3 vortex v6 motor misfiring on cylinders 4, 5, 6. i have changed the distributor, coil and the module that bolts to coil, and the spark plugs, wires, and distributor cap and rotor and still still have misfires on cylinders 4, 5, and 6

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Misfires can be caused by faulty ignition components, but they can also stem from other components. Such as faulty injectors, or improperly timed or unseated valves. Sounds like you have touched on all of your ignition suspects.
Are there any codes present other than P0304, P0305 and P0306? If so they should help guide you in the right direction. If not, You might want to make sure your valves are seating and if so, go ahead and swap an injector from a misfiring hole with a good one from a hole with no misfire. (like switch #2 and #4 injectors for example) if the misfire moves to cyl 2, you know the injector is at fault.

Posted on Oct 02, 2010

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Cylinders:
.......(
back).......
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Cylinders:
......(back)......
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