14 Silverado 5.3 with 85k. I just bought it within the last couple weeks. Already changed the plugs, wires, oil, added my catch can. Plugs and wires definitely needed changed. Had a rough idle and now that is gone. Have not shut off the afm yet. Already got more than twice the amount of fluid that I would even get out of my tuned 6.2 with my catch can. Anyone having any issues with theirs over 100k?