Love this car perfect daily my grandad used to own one like this a Fusion 3 but a 1.6 petrol that’s a 1.4 diesel but still rlly good car perfect first car my grandads was red quite rare rlly cheap strong and reliable
Very possibly the other possibility is an issue the injectors or the or the injector pump. Worth checking the injectors before the pump as it is easier, but filter firsr.