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P0191 FORD -

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Need help diagnosing codes po191 & po300 on a 2003 ford focus se with 31,500mi. I am using a Action brand cp9125 obd-2 PocketScan meter. Car runs, but backfires and stalls out when warm.
Information about possible repair solutions would be greatly appreciated.

Vehicle: 2003 ford focus se 2.0 zetec

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