P0171 Ford -mustang

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anonymous · Answer 1 · 2017-04-24T18:22:13+0000

Check for the PCV tube's might be torn open and causing a major vacuum leak.

Intake manifold gaskets that are leaking vacuum.

A dirty MAF sensor (you can clean the sensor with mass air flow sensor cleaner)

Fuel pump that's going BAD, but hasn't completely fried yet. (check fuel pressure)

also could be a bad oxygen sensor on bank 1 sensor 1