Why does car stumble after warm startup? on 1998 BMW 328i

I replaced PCV, fuel filter, gas cap, purge solenoid, purge valve, intake boot, numerous vacuum lines. Computer keeps showing a P0454 and P0455 along with P1250. I know P1250 is generic. No noticeable leaks. Check all vacuum lines for EVAP too. Puzzling.

Asked by for the 1998 BMW 328i
Could be charcoal canister problem or the control valve for it.