Yes yes i know, its a 306, it could be lots of things. Heres a summary. Took it in for MOT, knew it had a misfire but was lazy. Failed emissions slightly, mechanic reckoned it was deffo the misfire because of how the carbon had risen dropping the lambda way low failing it on both counts. (also my back pads were shagged but thats another story). So i get it home and head to the motorfactors for my pads and some plugs. Remove the ignition coil pack (yeah 16v so no HT seperates etc) check the plugs. GREAT, i think, the 1st plug (driver-most side plug) is coked with soot despite only being 3months old. The others have that lovely tan look (healthy) so i change the set to be safe. Oh dear still missing. I decide to check if it's that cylinder by sequentially disconnecting the injector connections. The only one that shows no change in engine sound is the first one (that had the cack plug). So the trouble deffo seems to be that cylinder not firing correctly. So first things first i go to the local scrappy and get a coil pack, 2 in fact (they know me and let me return one esp if i can cert it as working or not) neither changes anything. One made it a lot worse but i suspect that it was faulty and thus giving 2 faulty cyl's on top of the existing problem. The other works directly as my original did. The odd's on them both faulting on the same point? na dont think so. So i move onto the injector assembly. First i switch the connectors to try and shift the fault to another cylinder. Nope its still number 1. Then i remove the fuel rail and swap the injectors. Still same problem . Any idea where i could go from here?