Engine stalling after warm startup

I’ve had my Impreza for around 4 and a bit months now and am now adamant that there’s something not 100% right with the engine startup routine.

It seems like every so often, when I do a warm engine start, the engine would get itself to somewhere around the idle rpms and then keeping revving up and down around 100-200rpms for around 5 or so seconds after which it would inevitably stall itself. Starting up the engine again works fine and this never happens on a cold start. I’ll keep an eye out for it and mention it on the next service unless it gets any worse.

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