Hello,
I have a 96 Lumina 3.1 and the engine light is starting to come on. It will start blinking for a few seconds and then stay on. It will go off in a couple of days but then will come back on. The car runs and idles great and it seems to only do this at highway speeds. The code is P0300. The car has 250,000 miles with new spark plugs and wires (AC Delco). Any help would be greatly appreciated.
Thanks