Can you post the freeze frame data
Are the codes being set at idle or at higher RPMs
If fuel trins decrease at higher RPMs suspect vacuum leak.

 

what he said^^^
if not that maybe bad fuel??

 

P0171/P0174 - lean condition.

Good info above, but the first thing I would do is clean the MAF sensor. CRC makes a MAF spray. Disconnect elect. connection - remove 2 small screws that secure MAF; then pull it out of air feed tube. 2 places to spray down on MAF. Don't be stingy with the cleaner. Let it air dry for a good while - 45 mins or so; then reinstall. After reinstallation, clear codes and drive. If it happens again, the MAF is bad or you are dealing with one of the other dozen or so conditions that can set this code.

1. Air induction
system
2. Injector blockage
3. MAF meter
4. ECT sensor
5. Fuel pressure
6. Gas leakage from
exhaust system
7. Open or short in A/
F sensor (bank 1
sensor 1) circuit
8. A/F sensor (bank 1
sensor 1)
9. A/F sensor heater
(bank 1 sensor 1)
10. A/F sensor heater
relay
11. A/F sensor heater
and A/F sensor
heater relay circuits
12. PCV hose
connections
13. PCV valve and hose
14 ECM