[Longshot270]

Well since they sent you a letter saying your warranty is extended I think you should put the stock intake back on and return to stock on the programmer. Drive like that until the P1000 code dissappears on its own then take it to a dealership with the letter in hand saying you've been getting the P0172 code and your tired of clearing it. As long as the injectors are covered I'd try to get it fixed before something breaks.