1999 GMC C3500 engine backfiring through exhaust while cran

1999 GMC C3500
100,000 MILES • V8 • 2WD • AUTOMATIC
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JOURNEYME
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while cranking the engine there is backfiring in the exhaust & motor will not start. can u please tell me what the likely causes are?
Nov 12, 2008 at 11:50 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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