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I have a PO 171 code and I can’t figure out where the problem is coming from I changed The valve cover I changed both O2 sensors I change the purge valve I smoke the car there’s no leaks and change the mass airflow sensor. I also check the one hose that has the air check valve no air blows through it like it’s supposed to when you blow in the one side. I also checked for that nipple like thing in the intake manifold where the one hose hooks up to towards the back of the engine near the purge valve and it’s dirty but I can see the nipple there …The car don’t stall or idle rough it runs and shifts just fine I don’t know where the problem is coming from..??????? Help please
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