hi chaps

hoping someone can help

i rebuilt the engine bay of my fiesta rs turbo last year with new everything, new engine(bottom end & head), gearbox, clutch, loom hidden in inner wings, fresh paint ect ect, but ever since then i've had a issue of the engine stalling only on cold strat up, once it warms up it's fine

it has all new sensors, new fuel pump(bosch 040), new fuel pump relays, no errors on my collins monitor, replaced ignition plug with soldered joints, new ignition live to ecu, the iscv is modded for ALS so that isn't a issue, management loom has been replaced with a braided one

any other thoughts, suggestions would be greatly aprichated

Paul