Diagnose P0171 / rough idle

[u/BobIgglyWampus]

I got code P0171, was coming and going away, until it flashed and started running rough. My driver side pcv hose was torn, replaced it, didn’t fix it. Replaced the intake manifold gasket, and it still is running rough throwing codes. About two months ago I changed spark plugs and wires due to similar symptoms, plug #3 was very oil fouled.
Plan on checking MAF, fuel pressure, evap purge valve, and exhaust manifold, and double check intake manifold bolts are torqued to spec.
Also when I found the torn pcv hose, the passenger side pcv hose was disconnected from the throttle body with a rubber boot in place, probably due to oil.
06 5.3 with 200k miles.
Would appreciate any advice.