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Sorry you're having problems, jonzi.
I see you recently fitted iridium plugs, (which I also have on the Evo). I don't know if you're aware that, because of the narrower centre electrode, you need to use a larger gap than the standard (on the 1100 Evo) of 0.7 - 0.8 mm.
For a good fat spark, 0.9 - 1.0 mm is recommended (I'm using the full millimetre).
If you haven't already done so, try a larger gap and see if that improves things.
These iridium plugs aren't as robust as standard copper-cored ones though so, if you do adjust them, use a proper adjusting tool on the outer electrode only. If you try to prise the electrodes apart, the centre one could break.
Hope you sort it quickly.
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