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Stage 2 K04 - missfire!

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JakeyGhost:
Hello fellow MK5'ers.  I have a K04 converted Golf that has been running a stage 2 absolutely fine for the past year.  Lately, she has been very rough on start up and idle.

I have replaced:
Spark Plugs
R8 Coils
Oil & Filter
Fuel Pump & Filter

My problems seem to go away for a few days upon changing each part, although the misfire still persists.  Upon removing errors the car runs perfectly but slowly deteriorates and EML comes back.

Now that I have tackled all of the ignition and fuelling issues.  I'm thinking my Lambda sensor is ****ed!

If anyone can help with me, it would be much appreciated!

Here is the diagnostic scan

Engine management 1
Engine management Motronic MED 9
P0300
Combustion failure detected
Less than minimum
P0304
Combustion failures detected in the component .<Cylinder 4:
Less.than minimum
P3266
Lambda sensors (bank 1) Internal resistance
Value implausible
P0030
Lambda sensor heat circ (bank1 sensor1)
Open circuit

Many thanks for your time!

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