mk2fiestaryan

driving to work on tuesday and my car started juddering like it was a fuel problem then stopped. got it recovered to my mates garage who has a lot of knowledge about this car. we changed the inline fuel filter, cleaned the fuel lines and tank and cleaned the carb. took it for a test drive then did it again, any1 know what else this could be. it only does it when it is labouring slightly up hill. confused