SamT9

So I have a 17 model 2500 that’s giving some trouble. It’s at the end of its life and starting give lots of hell. 200k hard miles. So I rescently let my back brakes get pretty bad. They screeched for 2000 miles before I could take time to replace the pads. Towards the end of that it started coming off cruise while driving and giving a “service stabilitrack” message. It goes away instantly. This pickup has given that message since it was new when you got in mud or sand or a rough road. It’s getting worse now that brakes are fixed. Also flashes ABS at the same time now. Some times you can go 100 miles and others it goes ding ding every 20 seconds. What should I look for? I haven’t checked codes yet, engine light stays on because of bad glow plugs it obviously doesn’t need but chevy wants 3500 to fix.

2017 Chevy 2500 with duramax diesel. my stock air box has given up. The over size screws I put in it long ago are stripping out and the hose to the TB is cracked. chevy is supposed to be pricing me a new one. Parts store couldn’t find me a replacement, but can get a K&N for $400. I will probably do what is cheapest. Will the K&N go right in and not cause codes?