dealership said it is poor fuel quality.. ok.. the engine is running fine but that engine shaped light comes on every so often.. i mean the car would drive fine for a long time then that light comes back on and i feel a little bit of a jerk when it switches gears..(note the jerk is seldom) and its strange becuase twice in a while the car turned itself off at a red light then i had to turn it back on again.. does anybody know what is happening? if u quite understand where im coming from.. i dont know what it is?

Need to know exactly which code it is storing. I seriously doubt its bad gas.

If its under the year 2000 i would try to fix it or go to a repair shop, but if its over 2000 i think there isn't a problem