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Re: 1992 454 backfires & looses power by mike e
Yes change the filter first.If thats no help check if you may have some older winter gas in the tank and now its geting hotter.Some mountain gas has lower octane if you may have got gas last summer in the mountains.Also at about that mileage those 454s start to see the spark plug wires go bad.Bad wires will cause some backfire usually under load.Also you might have fuel pressure checked.Don't do anything till you change fuel filter.Good Luck Mike
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