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

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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.
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