Loss of power,missfire feeling and a ran dome p0306

OK heres my issues..I got this truck about 2 weeks ago and had a p0306 code and the truck was laggy so what have I done?
Plugs
Wires
Dizzy cap
Rotor button
Removed cat
Seafoamed the vac system
New Tps
New iacv
New pcv
took out injectors 2,4,6,8 and cleaned with carb cleaner
Checked ohms of #6 injector and compared with #2 and 4 and all are 15

It runs better since all that but I still get a random p0306 and the truck always feels sluggish and always feels like its miss firing like its very choppy at idle and low rpms and going up hill, also gas milage sucks..200miles a tank(22 gals)

Mods are
35x14.5x17 wheels
Spectre filter and that's it...also this IS the sport,off-road model with 4.10 gears so the tires shouldn't be a prob...so can I have some help here please??
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Part of me wants to say clogged catalytic converter. Does the engine feel like it is fighting itself? Does the exhaust sound different? Bad O2 sensor(s) would cause a surging. But a backed-up cat may do the same thing.

Well, I had random miss fires with bad o2 sensors. You removed the cat so your downstream o2 sensor is reading funky unless you have an o2 simulator which you probably don't because you haven't mentioned it. I'll say the combination of the removed cat and the o2 sensors reading funky or not being there.

yeah i had that problem when i had my cat off and the 02 sensors were in it ran like complete crap then for some reason it messed up both o2 sensors, as soon as i put new sensors in it was a night and day difference lol

Have you pulled plug #6 to inspect it to see its condition. Can pull the plug and run a bore scope down the hole and inspect the piston also.

Remove the injector from cyl 6, and swap it with another cyl. Lets see if the problem moves!