16v was running like Poo over the last couple of days, so decided to change the sparks, Spark plugs 1-3 where the normal brownish white tinge, but when i pulled out the 4th, the tip of it was burnt black, not oil covered but more charcoal , any ideas why this is?
also are the injectors easy to change over, mine are 210K miles old, so i think they could do with replacing.
cheers
