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Next time ask autozone what the actual code number is. It's called your OBDII code (on-board diagnostic 2). For example: P0440 = "EVAP system malfunction". You can look em'up right on the net. From what autozone told you, I would suspect you have an evaporative emission system issue. Most likely cause (believe it or not) is a bad gas cap. If your cap does not seal tight, or the cap's internal check valve is shot, the pressure in your gas tank will bleed off & you will get a check engine light. For OBDII compliant vehicles (all 1996 & on), you need positive presssure in the gas tank all the time. For a couple bucks, try a new gas cap.
G/luck
Joel
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