Fuel pump control unit
Nah fuck it..........

Why are you asking everyone to diagnose your car?

In your other thread about this exact issue ----->>>> You had MMS have a look at it but obviously didn't want to fork out for a proper diagnostic of the problem or have them fix it.

You only seem to be telling half of the story......
Who retuned it?
How could they have retuned it if it was running like a bag of dicks?
Did they notice a problem and tell you about it?
What was the result of the retune - power - torque - boost?

For all we know the car could be running on 3 cylinders and oiling up the plugs.......and you may be looking for a miracle......

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