Back in January on a very cold morning I tried starting my car and this happened, car starts ok but after approx 8 seconds the car idles erractically and then eventually dies. It does this all the time.

I've changed the MAF and the fuel pump and have done the idle relearn and still the same problem. No codes are showing.

Just wondering if anyone knows what i should try next? could it be a vacum leak or bad fuel? any help appreciated.

The car is a 2006 Subaru WRX.

I'll try to upload a video.

 

Vacuum leak somewhere

 

Possibly a vacuum leak or dirty air control valve?Bad fuel is less likely if it runs the same every time. I’d smoke test for leaks first, then clean the throttle body/IACV and check live temp readings.