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Re: Multiple codes
the P1406 is related to the egr pintle position most of the time it's due to carbon build up, try removing it and cleaning it. check for vacuum leaks at all the lines and around the intake and proper operation of the IAC(idle air controller) for the idle problem. the #6 misfire might be a dirty injector. a bad coolant temp sensor will affect millage and driveability so you'll wanna swap that out right away make sure the connectors in good shape too.
good luck
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