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like to know what parts to fix or replace to clear check engine light ,i see my question was asked but not answered by another user .
Vehicle: 2001 Chevrolet silverado 4x4 5.3

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P1404 EGR position performance

The condition you have when P1404 set , is for  the EGR, what happens the ECM is commanding the EGR to be closed, but the EGR is still in the open position. which results in rough idle , Replace the EGR , clear the code

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