Got the p0300/p0305 error code. Replaced spark plugs as they were within 5k of needing to be changed out anyway. CEL is still on. Is there anything else I can do? I'm thinking it might be the 09-007-06 TSB but I have no way to test that other than take it to dealership.

How bad is your engine running right now? Do you feel a hard misfire, horrible noise, or it won't run?

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2006 Sport 4X4, Deep Beryl Green, NSG370, NV241J, Lifted with OME 927/948 and Bilstein, JBA 4.5 UCA's, Custom 3" Rear Y-Link Extension and Swaybar Relocation, 265/75-16 Toyo Open Country AT2 tires, Black Plastidipped bumpers, flares, and doors, Pioneer speakers, Alpine head unit, 1200w Phoenix Gold Amp, 12" Dayton Reference sub.

Doesn't seem to be running too bad, idles a little rough but it always has since new. Feels like it doesn't have as much power as it used to though.

check coil packs?

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Steve
2018 RAM 1500 Rebel
2003 KJ
Mods:Exterior: Frankenlift + 2 extra rear iso, JBA UCAs, ARB Bumper w/XRC8, Safari Snorkel, 265/75/16 AT, Mopar Skids, Boulderbars, RL Gecko Sport Rack
Interior: Infinity Reference speakers, 12" Alpine Type R Sub, Alpine radio, Gauge Pods (Oil, Volts), Cobra Cb, All J Interior Rack

switch the coil on cylinder #5 around with another one and see if the misfire follows the coil or stays on cylinder 5.

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2006 Sport 4X4, Deep Beryl Green, NSG370, NV241J, Lifted with OME 927/948 and Bilstein, JBA 4.5 UCA's, Custom 3" Rear Y-Link Extension and Swaybar Relocation, 265/75-16 Toyo Open Country AT2 tires, Black Plastidipped bumpers, flares, and doors, Pioneer speakers, Alpine head unit, 1200w Phoenix Gold Amp, 12" Dayton Reference sub.

Switched coil packs...stayed on 5 so then I switched injectors...stayed on 5. Did a compression test and had low compression (135) on 1 and 5.