hi all

i have just recently acquired another fiesta Got it through the mot etc but there seems to be a lot of judder in the 30-50mph range. Its not excessive but its a right pain in the arse in slow moving traffic. Im going to get a plug and filter change as soon as possible but could anyone suggest anything else? There is an exhaust on there which im unsure of what make it is but the chap at the mot station said it could be a possible cause as its popping quite a lot here and there? going to try replacing plugs and leads as soon as possible.

the car is a mk3 fiesta xr2i 16v

cheers