help loss of power fiesta 1.25
a friend came to me for me to have a look at his fiesta as it feels realey down on power and has a sputter at light revs so i changed his plugs but its still the same 3 plugs where light brown and 1 was black so changed his leads he has run out of petrol a couple of times to i know of so i was thinking fuel filter blocked injectors blocked exhaust blocked cat failed?