I’ve had a pesky p219a code ongoing since about 1hr after buying my car in January. She had one prior owner and I am uncetain I have slight lag that seems to manifest around 1,800rpm but goes away. I am stage 1 COBB ots right now.
currently I have replaced:
1. evap purge valve
2. PCV valve
3. Ran crc intake valve and turbo cleaner
next up I am replacing:
1. Injectors
2. Upstream O2 sensor
3. Downstream O2
things have gradually got better with my “fixes” I’ve done as far as Ign Corr and overall car response. There are a few p219a threads out here on the forums I’d look into for that. P0454 appears to be EVAP related like what Typhoon mentioned