I just purchased my 2010 Ram 1500 Big Horn, and love it. Having one problem with the engine though that I'd appreciate insight on. The engine runs rough when it's under light acceleration, and is especially rough around 1,500 rpms. At higher RPMs or under fuller throttle it runs smooth as can be. Idle is good, no check engine light, and no codes tripping. It almost sounds like it's in the wrong gear and bogs down. Any input would be greatly appreciated.