why does my car backfire?

1995 HOLDEN COMMODORE
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KAURIBOB
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V8 commodore vs starts with a whinning idle, then afta 15 - 20secs it idles like a V8 properly.
Drive down the road then it backfires with 1 big loud bang &
then wont start.
Changed spark plugs, check exhaust pipe, replaced new leads, carbuerator cap seems fine, changed filters
Jun 1, 2012 at 8:10 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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