kh ford laser stalling problems

[no car luck]

i have a kh manual ford laser i have to pump the accelerator to get started and keep going as soon as i take my foot off the accelerator it stops i have to do the same to change gears when in 2345 gears runs ok but when i take my foot off the accelerator or put it back on it starts jerking when i slow down at a round about or have to stop it stalls i have changed the air cleaner and fuel filter checked the fuel pump doesnt seem to be any vaccum leads off can someone help please