Still grey smoke , couple of possible issues, and where is it located?

So, I noticed a wire hanging from underneath the cowl plugged into the air box headed into throttle body, helped a little with the grey smoke and rough idle. Also found vacuum line off of the right-side rear of valve cover cracked, taped and re installed. still burning a qt every couple of days, way less blue smoke. still there lightly under acceleration, noticed it’s struggling to top 50 on highway, running horribly, misfiring. Also, my check brake light is now on, not sure if rely, check engine lights been on forever with no codes. Now when hitting a bump, the truck dings, the check brake light goes off, check engine light goes off, then both immediately turn back on, lol. The lord seems to dislike me as of late! I know this is a lot of things but any suggestions please, you previously said that it sounds like valve guides, still feel like that?? Or multiple things, oils color is ok, coolant ok, all gauges are right in the middle. Ugh trying to give you all of the info, sorry bro, thanks for your time and advice it’s really appreciated, your friend who should have bought a Silverado, lol.