Cylinder 4 Misfire & P0130 code...just lucky?
 

Howdy, is there any reason why these two codes would be showing up together? The P0304 has been persistent, and I'm getting ready to swap out the coils, wires, and plugs, but wondering if the P0130 could be related to the misfire in some way, and if there's something deeper I should be looking at.

Likely not related. If the P0130 was related to misfiring it would more likely be multiple cylinders on Bank 2, not just #4. A bad O2 can trigger misfires but likely not on just one cylinder.

Thanks for the reply! If a bad o2 can theoretically trigger a misfire, is it possible that a misfire can trigger a bad o2 reading?

Oh bother...so this past weekend I noticed that after about 10 minutes of driving the truck would idle really low and start to get rough. Like at park, it would have around 620rpm. If I kicked it into Neutral, the idle would go up and the shimmy would stop. I refreshed my scanner, and got these pending:
https://cimg2.ibsrv.net/gimg/landrov...78da6c8eca.jpg

I'm nervous now that I screwed myself by waiting to fix the misfire (which would eventually fire about 15 seconds after start, I never drove with it misfiring), and now wondering if it's messed up my cats.

What's step 1 here, oh more experienced ones?