Check Engine Light On problems of the 2008 Chevrolet Uplander

The check engine light has come on and stayed on since this date. It was a fleet car that was serviced by a dealership for 161,000. My husband told the dealership every time the check engine light is on, but they never would fix it. We bought it from fleet company and we took it by the same dealership to ask them if they could help us and the owner proceeded to tell me that it has too many miles on it and it is out of its warranty. I told him you are the dealership that serviced it for all those miles and you knew about it and have many records of the complaint and did not fix it. I then contacted gm and they would not help me either. It is wrong. It also has a problem with the fuel system too. I was stranded at work one time. If you park on a slanted hill and you have a quarter of a tank of gas it will not crank. You have to bounce up and down on back to shift gas and it will sometimes crank.