2007 Chrysler Crossfire Bang! Rough idle

Had my neew 07 crossfire less than two months, I always drive it carefully during the break in period. Today I went to start it, heard a loud "bang" from the engine, then it dropped to idle speed and idled like a tank, less than 400rpm. Shut it off, started it again, no engine bang, but it sputtered and idled poorly, and died. Started it a third time, it will idle, however,
very rough, put my hand four inches from the exhaust, definitely not firing right, the kind of "puff puff" intermittent exhaust an Alfa would make when the engine was missing. Im afraid at this point to drive it and put a load on the engine, not knowing if something has gone seriously bad or if its a small issue. NO engine lites have come on. Any help appreicated, I love my crossfire, and want to keep it from dying!
thanks! Scott