Chevrolet Cheyenne Computer Replace/Remove

Need To Fix Cable To Ecm . Box Feel Off And Broke The Cable Can It Be Repaired Or Can It Be Replaced Where Can I Get New Cable

I Have The Sdm Module In My Hand But I Cannot Remove The Connector From It, Is There A Trick To Getting This Off.

I Recently Took My Truck To My Dealer To Have Them Give Me The Codes From The Computer Because I Was Having Some Pretty Bad Misfiring...