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4runner misfire

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Old 09-21-2011, 11:15 AM   #1
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4runner misfire

Anyone know the cause of this ??

Recently my 2001 4runner has been misfiring ,I pluged it in to get codes it reads

P0300/random multiple cylinder misfire
P0303/cylinder 3 misfire
P0306/cylinder 6 misfire
P0171/system to lean
P0420/catalyst efficientcy below
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