Ok so ive just ordered the genuine Subaru o2 sensor should be here for Wednesday will get that fitted next weekend. I'll post up if there's any change. So far I've
1. Put into a garage only to find 1 fault code indicating the 2nd o2 sensor. This was changed, no fault codes. Spark plugs and HT leads changed. Same issue.
2. Had the same garage check out the fuel pump. All good flow and pressure.
3. Changed the fuel filter in the engine bay along with the air filter, still nothing.
4. Got a replacement coil pack, map sensor and PCV valve. No change still got this same issue.
If this o2 sensor doesn't sort it out in really not sure what else to do. Especially with no fault codes!