I have the above that drives with lack of power from cold not revving above 3500 rpm and very sluggish unless you cycle the ignition and then it regains power for a short while before dropping back to sluggish. This can happen up to 3 times before it works fine for the rest of the drive. If the car cools down it may mis-behave again or wait until the following day.

I have tested fuel supply (new filter etc) and all live data has been recorded whilst faulty and normal and all appears to be the same, EGR taken off and cleaned - visually ok and works when asked, air mass / boost readings look ok.

Has had DPF removed before i looked at it and "mapped out", i'm told the fault was there before that happened ?

The odd bit is that no fault codes or MIl light when faulty which suggests a mechanical issue but seems strange when cycling the ignition seems to restore power.

Anybody had similar (Same engine etc as Fiesta)