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2021 Trail Boss LT L84 10L90
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P0454 is a problem with the EVAP pressure sensor, nothing to do with fuel pressure.

Your rich codes and cold start problem may be a wrong calculated alcohol content. If you never run E85 and the alcohol content shows over 10% on a scanner, it needs to be reset with a scantool.

I believe there is a reflash available for the calculated alcohol content
 
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