The problem is cold, cold start when you start your car idling is very irregular, if not accelerate and try to get out through the exhaust explodes after unsos seconds and doing well. I think it may be the wiring ...
Has proven anything but: flowmeter, lambda probe (it is new but not original, the disconnected and remains the same), fuel pressure regulator, idle valve and UCE
Sometimes also with warm engine speed and try not respond, going as drowned and hits a pull and suddenly goes well