Just got me car back on road but ive got 1 problem when i start car up in the morning and drive to end road my foot nearly hits the floor when trying to brake and car starts to stutter and nearlly stalls.now car has had abs taken off but this was ages ago and its also had 2 new rear brake cylinders for last mot.ive tried bleeding the system but there is air coming from drivers rear all others are fine.to me it sound like might have a dodgy brake line but just want check if anyone can think of anything else as its weird how it make car stall nearly????

cheers
jon