check engine light
You guys need to read your codes. It's very simple. Go buy a Chilton's (or Hanes, or the dealer manual which is expensive) and read how to do it. Even if your check engine light only goes on once in a while you'll need to pull the codes to see what "blips" the system found. I definitely wouldn't just ignore it like ChunkFunky said. Why not try to make your Mustang run as well as possible?
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