hy after a engine rebuild it don t start when the blue is on the cold start injector

an the black plug on the auxiliary air valve (the correct conection)

but if i change and i make the black plug on the cold injector it start but smoke a lot of black smoke at the excaust and then when the engine is still running and i want to take off the black plug on the cold injector the engine runs higher and after about 1 minuts it s stop

my 4 injector works they injecte the same quantitait of fuel

hmm strange no sorry for my english