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
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MHPAUTOS
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sticky valves may be a problem, is it backfiring in the exhaust or the inlet, how many Km's and have you had a scan for any unresolved electrical problem yet?
Jun 1, 2012 at 1:21 PM