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There are few reasons some simple some not. Check your gas cap make sure it is tight and not leaking. Check to see there are no vacume leaks under the hood. If these check out then you need to hook up a code reader to the OBD port and see what "P" code number reads.

If you do not have a scan tool any autozone part store will hook up a scan tool for free.

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Q: 1993 ford thunderbird check engine light comes on during acceleration?
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