Latest update.
Compressions are all equal at 115psi which I'm assuming is ok with the 
decompression plate. When I took the new plugs out to do the test they were 
very sooted up after running the engine whil watching the Megatune. Megatune 
was showing AFR of around 10,  so very rich. Could a faulty lambda cause this. 
I've read how to test the lambda out of the car using a blow torch and 
voltmeter but it seems the 5 wire wide band ones are harder to test - anyone 
tried it ?

It won't boost up to positive, just goes to 0 then backfires. Turbo issue maybe?

Bob

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