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B1201 + B1204 = random misfire. Fuel filter?

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I have a mk4/5 Ford Fiesta with 1.25 zetec engine, year 2000.

Starts perfectly, has power, but engine ligh came on and two errors are present:
B1201 and B1204.

Given that the engine just seems tou misfire randomly /cough randomly, could it be the fuel filter?

Vehicle: 2000, Ford, Fiesta, 1.25 zetec

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