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Mine's always popped a little too. I got a cheap scanner on it and it said "multiple/random cylinder misfire" and 02 sensor fault. I cleared these and it changed to "cylinder 3 misfire". Wonder if it might be coil pack/injector and the O2 sensor could be an old code.
Did this ever come back or was it fully sorted? I literally have the same problem but it has come in stages... originally the high-pitched exhaust type noise from when I bought the car, last month or so the emissions light flashed occasionally when idling (more so before the car was warm, but...