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I forget the exact CEL code number, but it was like P013X or something, and usually comes on BEFORE the P0171/P0174 CEL codes, depending on the bank(s).
I personally had a P0174 code constantly, after clearing the initial P013X CEL code and driving the car. Everything seemed fine, except the lean CEL code and mileage dropping pretty significantly, about up to a loss of ~4-6 MPG.
However, this was particular to my situation after months, when the P013X CEL came up constantly and did not go away; and would trigger the P0171 code if I cleared that and KEPT driving (or keep the engine on). Ended up being the bad primary/upstream O2 sensor for that bank. Took out both sensors, and the bad one was covered in tons of black soot.
I'm also tuned and have long tube headers; where I see lots of bare metal header upgrades, typically heat-soaking old primary O2 sensors and killing them off. I also had primary O2 sensor extensions, which I thought went bad; but I ended up replacing the extensions as well, and the sensors; which solved my problem.
I'd probably clear the code and keep driving, and cycle the car and see what codes come up and when. I haven't really messed with my mostly stock car, so I can't say the same if you're heavilly modified. The only vacuum things that I've messed with, are the intake manifold, some of the PCV lines from the engine valve covers and engine valley cover (LS3); and I even checked my MAF sensor and intake/airbox, which were all good.
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