Hi guys not used this site in a long while not had any problems really

my exhaust pops rev it and u hear a pop pop pop towards the end is this normal on focus's cos our moms focus dont do it or am i going to be needing to check exhaust out cos i have a strange feeling this has somehting to do with the revs dropping when i slow down cos if u blast it down motorway the revs dont drop anymore they fine for about a few days

let us know if u lot get same problem also coudl it be fuel filter never been changed done 73,000 in it now