Right, what r the main causes of over fuelin? pulled my plugs out 2 day n they r sooty as hell, ive just swaped over 2 clossed loop n waisted spark so it aint the chip, i think i may have a air leak somwhere 2 would this cause issues?

The cars booked in with stu 4 a set up in next month, but its a bout a 200mile trip from mine 2 blackpool could do with checkin everthin over once b4 i go so i dont do any damage 2 the car

Any suggestions welcome

Cheers jay