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According to Haynes Repair Manual, for all 1988-1998 GMC Sierras, the firing order is 1-8-4-3-6-5-7-2. In case it is needed, the cylinder numbers are from front to rear, left(drivers) side 1-3-5-7 right side 2-4-6-8

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15y ago
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Q: What is the firing order for a 1990 GMC Sierra V8?
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