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i have a 1997 toyota 4runner and the engine is backfiring on 1997 Toyota 4Runner

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changed the fuel filter and sparkplugs and wires changed the front 02 sensor as well im out od ideas? any advice helps thanks
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yes its back firing through the exhaust, but intermittent it also has power loss and is hard on gas.... i looked under the hood and it calls for dual prong sparkplugs i used the single prong ones.... it doesnt run bad all the time thou just on occasion im planning a trip to the beach and want to get it fixed before we leave thanks for any advice
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