The first thing I would recommend is to have the computer scanned for trouble codes. If no codes show up, you will need to have an active scanner running when the problem occurs. If the light is flashing, that usually indicates a misfire. Since you already tuned it up with no change, I would have the scan done and check fuel pump pressure to make sure it is within spec.
Wednesday, June 5th, 2013 AT 9:43 AM