03 Silverado 5.3L surging on idle and leaning out.

[Jimmytheunprofessional]

My Silverado has about 219,000 miles on it and has recently began running horribly. It surges on idle and such but only when at temp. Once your driving and reving it drives fine just at idle. I just replaced the MAP sensor which didn’t seem to help at all. It has all sorts of codes two of which were MAP related but the rest (I don’t remember the actual code numbers) were random misfires and leaning out on both bank 1 and 2 and heated oxygen sensor(only bank 2). Now I’m guessing from previous experience that it’s really one sensor cause a domino effect to the rest of the codes but I’m not sure which one and I don’t wanna spend a crap ton of money replacing everything cause I’m just gunna sell it soon any how. Any help would be appreciated thank you! As my name suggests I’m not a mechanic and quite frankly I’m very unfamiliar with LS engines.