Powertrain Control for 1990 Chevrolet Astro
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Auto trans. Manual trans. Astro, Safari. 4.3l. All models. 4.3l. All models. 7.4l. Thm 700-r4/4l60. Pick-up, Blazer, Bravada. 4.3l. 5.7l. Buick, chevrolet. Sends signals to the engine control module (ECM) to adjust timing Helps prevent damage to the engine caused by pre-ignition
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ECM
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