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My check engine light is on and it reads number 3 cilender misfire iv replaced s on 2001 Pontiac Grand Am

Diagnostic machine reads its running rich number three cylinder misfire fuel preshure sensor bad

Do you have the actual code numbers? Do you mean the fuel tank pressure sensor? Need the numbers!!
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2 more answers
take it to your mech it needs further diag to be sure whats actually wrong we would only be guessing
Unplug vacuum line off of fuel sensor see if fuel bypassing, check spark caps