I will have to check this out too. I was having a similar issue with my aveo. I would come out of work and let off the gas to come up to the light and by good luck it would turn green (or there was no traffic so I just went) and after I made the right turn I would get back onto the gas and it would just not go. As soon as I would let off the gas it would be ok and I could get right back on it. The hold and check engine light would flash...then just randomly stop.