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I'm getting a P0306, P0341 and a P1404 code, could this be one issue or is it more likely multiple problems?

Vehicle: 1999 Chevy Malibu 3.1 6 cylinder

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P0306 Misfire number 6 cylinder

P0341 Camshaft position sensor performance

P1404 Exhaust gas recirculation (EGR) closed position performance

When a false air enters the engine you get a lean misfire,What is questionable is P1404 and is it truly in the closed position,If it is just slighly open you can get a misfire on one particular cylinder , As for P0341 , excessive cranking  with no start can cause camshaft performance code, Suspect the EGR as the cause, as being slightly open .

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