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I have a 2003 5.3 sierra with about 128111 mi on it to be exact. I have been driving it around with the engine light on in the last few months. I ran a scanner on it and it came up with a heater curcuit and o2 sensors. Ive replaced the o2 sensor that was suppossedly bad and my engine light is still on after ive reset it. Now my engine light flashes at random times while driving or sitting at stop lights. I can drive for a week or even three without the engine light flashing and then one day the solid engine light will begin to flash. The truck runs worse when the engine light goes from steady to flashing. Since the light has been on the truck has had a rough idle and kind of lurches at stop lights. The mpg is horrible and im in need of some help quickly because i cant afford to pay for gas so often while trying to diagnose the problem. Im thinking it could be a fuel filter, injectors, plugs, or wires. I am very low on money though and my parents dont seem enthusiastic about helping me out, even though im only 17, so i dont want to do anything unecessary. I want to get it running well and get rid of the engine light that ive had to stare at forever. Thanks so much in advance for any help you can offer.:shake: