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    1997 GMC Truck Yukon 2WD 5.7L SFI 8cyl

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    1720 S RIDGEWOOD A
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    Electronic Spark Control Module

    Electronic Spark Control Module Operation:

    Computer signal commands sent to the control module either advance or retard the ignition system spark timing, basically doing the job distributor spark advance and centrifugal counterweights did in the earlier model vehicles.

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