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| Use the Product Search to list just the parts that match your vehicle. Images are for reference only and may not be an accurate representation of actual product. Electronic Spark Control ModuleUsed on 1985-89 TPI systems w/ MAF sensors & 1987-1993 TBI's. Filters signal from the knock sensor so that ECM can retard spark advance when spark knock is present. ESC is part of Mem-cal in 1990 & later TPI systems. 
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