Cool, thanks Tabetha.. I've got another CAT on the way, and the Lambda sensor that is currently being run was not off the car burning oil fortunately.. although I am still to test it.

I will give the MAP a test also, hopefully I will find a vacuum leak or something which will be really easy and solve aaaalll the problems

Failing that.. yeah my last port of call was going to be checking out the injector system. What kind of problems should I be looking at in them to cause rich running? Will leaky or blocked injectors cause rich running in some way? Not too up on EFI.. as you can see from the sig

Oh and yes all the plugs were coated in carbon, I've put new ones in now though. Air filter looked fine, not clogged or overly oily.. think I might take it out for the test though anyway?

Thanks very much, appreciate all the pointers