Flashing Air bag light

1992 Ford Taurus GL, 118,000mi, 3.0 V6. The air bag light on the subject auto flashes in a 3-5 sequence. The check engine light does not indicate any problem and the car runs fine, except for an occassional and very brief "stumble" (no particular speed), that feels more like a transmission "fart" than anything else (momentarily sliping out of gear and immediately back into gear, total elapsed time is one second or less). What deos this mean and what is the best way to go about diagnosing or fixing this problem? Thanks.

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