mousham

I bet the o2 sensor is fkd bcos the map sensor was disconnected fuuu :'( could someone please link me a new denso 22641 AA090 I don't wanna accidentally buy a fake or something

Ok - dug around the FSM I have
P1237 ECV +ve pressure solenoid LOW
P1239 ECV -ve pressure solenoid LOW
P1235 IACV solenoid LOW
P0031 O2 heater circuit LOW
P1249 Relief Valve ciruit 2 solenoid LOW
P0249 Wastegate solenoid B LOW
P0250 Wastegate solenoid B HIGH
P1247 Relief Valve solenoid LOW

ALL of which (apart from P0250) suggest that these solenoids aren't getting power (and the ECU is sensing the output is stuck LOW).

All these ciruits run off SBF-5 through the main relay.

Check SBF-5 in the main fuse box in the engine compartment.

Plug your diagnostic connectors together and check that your ECV is cycling and your solenoids are clicking.

If not -- then suspect the power to these solenoids. There should be 12V on one pin of each solenoid when IGN is on.

Alright so here's what happened just then. Put the car in diagnostic mode and noticed there was no clicking from the bbod, the bloody power unplugged itself slightly. Phew that's such a relief. I only have 2 codes now P0250 and p0031. Problem is I'm getting engine cuts still but only at full throttle at around 4k to 5k although there was one cut at close to 7k w full throttle

Did all this start after you installed the Walbro? The first 3 codes are all fuel pump circuit related.  
 
Check your front O2 sensor asap, if it is OK you can rule out the P0031 as it will most likely be from the first 3 codes & a result of the over fueling.
 
The last 4 codes are wastegate control related. 

Hey and nah I got the same errors like a week before i installed the walbro, it made no effect to the errors, I'll give the 02 sensor a check real soon, what should I look for on the o2 sensor?

Definitely something electrical -- and I'm guessing wiring/power to ECU.

Many of those codes are "XXXX solenoid LOW"

Check the whole engine harness back to the ECU and the power wiring to the ECU.

ill do my best but i should probably mention i have no experience w auto electronics. its sesh oclock rn so ill call it a day for today, ill keep u posted tomorrow when i get under the bonnet. cheers mate 

Sounds a lot like a spark breakdown problem. Check plugs and coilpacks

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the spark plugs are only like 3 months old, no idea how the coils r going tho, what would i check for with the coils?