I have cleaned all injectors and have two cylinders that dont seem to be fireing. i've pulled plug wires and tested with another plug and they have fire. I even placed two good injectors where the

probably the injectors are not working
run the fault codes or have the injectors for those cylinders checked
check wiring connections for the harness

Code 306 means cylinder 6 is not producing power. And as you know it takes fuel, spark, and compression at the right time to make power.
Generally, if the injector is firing at the right time the spark plug should be firing as well.
Are you sure the plug is firing ? And is it possible injector 6 has no fuel to spray ?

check the injectors with a noid light you may find a bad one. if not check the compression.

Have you switched the spark plugs to see if it is a bad plug ?
Switching the plug in cyl 2 with another cyl will tell you if the plug is bad if the problem moves to the other cyl.
It takes alot more voltage to fire a plug in a compressed cyl than it does out in the open. If the plug is fuel soaked it will never fire.

possibly wiring harness fault,sesor wheel installed backwards or an even fire/odd fire engine mismatched components

Without testing we would be just guessing . Hook up a spark tester to # 3 cylinder plug wire , is there spark ? Is the fuel injector for that cylinder squirting fuel , they make tools for checking this . Hook up a fuel pressure gauge an fire the injector , does fuel pressure drop. Could be a engine mechanical problem , compression test . Videos on youtube showing how to do these test's .

You've done a great job of trouble shooting thus far. I would certainly suspect the injector after all of that. But, I didn't see anything about you replacing the spark plug itself. I would try that first as a crack in the insulator (even hairline) will cause mis-fires. If the spark plug doesn't fix the mis-fire, it cold be caused by a bad fuel injector, bad signal (like a loose harness or bad wire) to the fuel injector, or a leak or valve issue on that cylinder.

This could mean that you have a bad/fouled plug or plugs, bad plug wires, bad coil packs, a misbehaving fuel injector, or a scad of other things.

I'd try new plugs and wires first. It's the cheapest fix and maybe the most likely answer.

I wonder though. It seems that I've seen codes that tell you exactly which cylinders
are not firing correctly. Your code seems to indicate more than one cylinder. That still points
to the things I mentioned above, but also strengthens the coil pack theory, as they feed more than one plug.

Try switching those plug wires with ones that are firing, if the miss fire transfers to those two plugs, then it's the plug wires.
I say that cause you didn't mention anything about changing plug wires. You changed eveything else.
You also didn't mention what engine you have. If cylinders 1 and 2 are adjacent to each other, take a compression test on them, if it's lower than about 150 to 160 psi then the head gasket is blown between those two cylinders.

hoopers51, Code 304 is for a misfire detected on cylinder #4. Check the wire and the spark plug for that cylinder. Make sure that there is no corrosion in the boots of the wire and see if the spark plug is fouled up, or wet with gas. If the plug is fouled (a normal firing plug will have a grayish color to it) clean it and replace it. If the wire is bad then replace it. Make sure that there is no corrosion on the coil terminal when you pull the wire off. You might want to test the coil if you have an inline spark tester. These can be purchased very cheaply at any auto part store. Also what you can try is to remove the plug on the #4 injector when the engine is running. DO NOT try this with the spark plug wire. (Do this when the engine is off) When you disconnect the injector you will hear a misfire if it is working properly and this will tell you that the injector is not the problem. If there is no change then you should check for power to the injector. (once again, when the engine is running) The injector on that cylinder may be weak and is leaking. This will dump too much fuel into that cylinder causing the misfire and you will have a wet spark plug. All of these, a bad wire, a bad spark plug, a leaky injector or one with no power, or a bad coil will cause a misfire and will increase the HC's on an emission test. Good luck with this.