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2003
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Chevy Express G2500, Van Cargo Extended, 5.3 T, 4L60E/M30
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Engine Controls - Service & Adjustment Specifications - 5.3L
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Ignition Systems
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Firing Order
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Firing Order
Fig 1: Firing Order (5.3L)
Courtesy of GENERAL MOTORS CORP.