I have just fitted my 1400 mk4 escort with an engine which is

mfi block (standard pistons, rods etc)
efi head and inlet (New valves, every gasket and seal replaced)
aftermarket management (no idea what it is) running a distributor
standard esrt mfi pump (outside tank)
standard injectors (are efi and mfi different????)
standar fuel rail and regulator (efi)
1400 alternator (just no had a chance to pick up a turbo one)
T3 turbo
Pace intercooler
-31 actuator (breather looped back to turbo) without looping it the car wont even start.
New spark plugs, leads, dizzy cap etc

The problem is that the car wont run properly. Its fine on first start up when cold but after less than a minute it starts spluttering, pops, farts, smokes wont rev, wont idle.
For a bit it was running great only really fast (high revs) then it went the way it is in the video below.


Im aware that any one of the things ive listed above could be the cause but i simply cant afford to replace them all so im hoping that someone on here with a bit of experience can point me towards the most probable cause. When it does rev up its not too bad in the higher revs but low down it struggles to run at all.

Please help

Thanks

Tam.