It turned out to be a "misfire" (code PO302).. basically they couldn't figure it out. the reason I am so concerned is that 1. it is a brand new car, and 2. coincidentally the car we bought the tucson to replace was diagnosed with a misfire, they replaced the cylinder coil, it didnt work, then it turned out to be an expensive valve seat/cylinder head rebuild.. i just wonder if it is a sign of a larger problem with the engine? time will tell
That's what I would recommend. The code you got was p0302, which is cylinder 2 misfire detected. I would clear the codes then switch the ignition coils from cylinder 2 with cylinder 4 coil and see if p0304 triggers down the road. If it triggers cylinder 2 again after you switched coils then it could be a cylinder 2 fuel injector problem or vacuum leak near cylinder 2, but it would need to trigger again to know for sure.