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this is from tpiparts.net
Electronic Spark Control module is repsonsible for monitoring the knock sensor output. It determines when knock is present so that the ECM can pull back on spark advance. This module is specific to engine size. In other words, a 350 module is different from a 305 module.
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88 Camaro
95 Impala SS
97 Trans Am WS6
98 Blazer ZR2
00 Corvette
04 CTS-V
04 Grand Cherokee
06 GMC Sierra
07 Sublime Charger Daytona
12 Tahoe LT
17 Malibu LT
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