C20xe over fuelling/won't start

[II MoorZ II]

I've got issues with a c20xe engine in my corsa. It's been in over a year now with no problems, but over the las t week or so it started stinking of fuel. Then the last two days I've had trouble starting it and when it did start it was idling at nearly 3000rpm. Now it doesn't start at all. I removed the plugs and they stunk of petrol so changed them and tried to start it, no luck. Checked the new plugs after and they then stunk of fuel. Also changed the coolant temp sensor as someone suggested that but still no luck! Any help would be greatly appreciated.