Sorry if I should be posting this elsewhere, let me know. New to forum. I just bought a 2002 Chevy Trailblazer LTZ fully loaded, and I am wondering if there is anything that I should check/service on the vehicle. Mileage 210,XXX, 4WD, owned in Midwest but has minimal rust. It has minimal wear and tear inside and outside. The only major issues that I have currently are a small stall at around 45 mph, it will come out of it if you press the gas a bit( I think it just needs new plugs). Airbag light is on, I do not know why or how to diagnose. I also have a service 4WD light occasionally, I believe this is due to a faulty 4WD switch that likes to move on its own. I have never owned a trailblazer or 4WD vehicle before, and I don't really know what to look for or to expect. Any help or recommendations is greatly appreciated.