I had the check engine light come on, on my 2003 Hyundia XG350. It would not shift on it's own. When I got to 3000 rpm's the engine woulf just cut in and out. My cruise would not work either. I could shift the transmission in manual so I came home from work that way. I took the battery cable off and this cure the problem for now, but wondering if it will come back. Do you have an idea what the check engine was saying is wrong?