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Nice thinking! I'll try to check it too.

Jonny, the black stuff is because when misfire happens, partially burned fuel is thrown on the exhaust. Would be nice if you could test if while in wot, there is dark smoke coming out of the exhaust. Probably it's only possible to note thar from outside. When I changed the coil pak, the...

The fact that the cts has 3 wires on it. Can the signal sent to the ecu be different from the one sent to the dash?

This is relevant to my interest... i've got same issues along with this one: http://www.cliosport.net/forum/showthread.php?663431-Petrol-Smell-amp-Missfiring

I'm with the same issue ish on my mk2 K4M 2006 sirius 32 flex. I have a k&N inbox fitted, and removed the cat, but only one lambda though. first it loss a bit of power, then was misfiring when cold, then all the time if WOT under 3000rpm. scanned the ecu, nothing wrong. changed spark plugs...