What do I have to look out for? rear brakes? Shifter cables/clamps? power steering? Gunky valves? random codes? What else do I look for?
Car has 74K miles btw.

Shifter cables were replaced so Check, Rear brakes work well so Check.
What other problems do LNF cobalts have to look out for?

 

i havent ran into any problems but then again i have 4 months with my car

 

Most have issues with the rear calipers, get in a habit of greasing the sliders every oil change. If you don't have Powell's PCV you will have valve coking that will continue to get worse until you have misfires. The front brembos have pins to hold in the pads that will get stuck if you don't take them out and put some anti seize around the fittings (mainly salt belt).