Getting an intermittent P0171 & P0174 Codes. After doing the following:
1. Replace All Spark Plugs with Bosch Platinum 4
2. Replace all intake seals in Intake Manifold
3. Replace all vacuum lines
4. Replace PVC vacuum line
5. Replace Idle Air Controller
6. Replace both Temperature Sensors
7. Clean Throttle Body with Cleaner
8. Clean Mass Air Flow Sensor with proper Cleaner
9. Replace Air Filter
10. Replace Main Fuel Filter
11. Reset All codes in Computer (there was never an engine light nor codes)
12. Fuel Pressure check at test point on Fuel Rail. (no pressure) Weird?
13. Replaced the MAF (Mass Air Flow) Sensor.

Any Ideas? Car runs great despite. Perhaps EGR?