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1999 4.3 vortec,installed new motor,have fuel and spark but…

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1999 4.3 vortec,installed new motor,have...
1999 4.3 vortec,installed new motor,have fuel and spark but will not fire.been over timing and firing order many times.i cant even get it to backfire or anything?
Submitted: 8 months ago.Category: GMC
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11/15/2017
GMC Mechanic: KALAMYKID, Shop owner, tech replied 8 months ago
KALAMYKID
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