You're welcome Myron, i'd try the filter first rather than the FPR although if it's high mileage it might pay to change both as a matter of course.
First because it's cheaper and second because if it has a partial blockage it might be reducing the amount of fuel through the pipes causing vapour locks which could give rise to the petrol equivalent of water hammer that you get in the plumbing at home from time to time.
Good luck with it and let me know how you get on!
