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1998 Xantia estate. 1.8i petrol 16v - engine cuts out for a few seconds. Intermittent. - legacyofpop

Averaging twice on a fifty mile journey, the engine will cut out for three seconds or so, no warnings, no spluttering or anything, just very cleanly on.. off...back on again. If I have to stop the car at these times the idle chuggs at around 500rpm. Whassat then ? Idle stepper motor and oxygen sensor replaced, ECU checked over, nothing changed.