Chevrolet Impala P Codes (Powertrain) P1400 - P1499

Hey Guys, So This Code Wont Go Away, P1404 Egr Pintle Stuck Open. Removed The Valve, Was Not Stuck At All Or Carboned Up. There Is A Tsb...

My Check Engine Light Is Coming On And The Trouble Code Is P1441. Do You Have Any Ideas What Could Be Causing This And How I Go About Fixing...