thanks for the replies. After finding another thread on the matter, i whipped the spark plugs out, and found something quite strange. 3 plugs were in good condition (the threads were coated in oil, not sure if that is bad or not) but the last one (nearest the bulkhead) was covered in black soot, which i beleive is a sign of overfueling?

The question is, how can 1 cylinder be over fueling, and would this cause this strange stutter?