Here is some info from the dtc list in my sig. Might want to check the ones you can like the regulator.
--Possible Causes--
Air Measurement System
- MAF sensor (contaminated, damaged, corroded connector, etc.).
You've already cleaned this
Fuel System
- Fuel pressure regulator (vacuum hose off, diaphram leak, malfunctioning, etc.).
- Leaking fuel injectors.
- Fuel return line restricted.
- Fuel rail pressure sensor (incorrect reading).
- EVAP canister purge valve leak (when canister is full).
Base engine
- Engine oil contamination."
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