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P0440 &P0106 errors 99 chevy silverado 1500


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Hey everyone. So I have a 1999 chevy silverado 1500 4.3l and I am getting codes:

P0440 EVAP system no flow during purge

 

P0106 MAP sensor signal range/performance 

 

To resolve these codes I have replaced my MAP sensor, my fuel pump which a different problem but it has the fuel pressure sensor on it. And my gas cap. 

Are these codes related? And what should I do next? The check engine light only comes on when I am doing 80mph on the freeway. 

 

Thanks.

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