If I swap the injectors the problem persist on cilinder 1

I try with a new set of spark plugs, new plug leads and a new complete distributor (with dizzy cap, phase sensor and all) and the problem persist

I tried with the two ecus of my other cosworths and with another fuel rail (with injectors and fuel regulator) and the problem is the same

Today I "know" some news about the problem: the car starts ok but after 10 seconds (aprox) starts to fail (notes the sound of a car running on 3 cilinders). And I think that at high rpm the car don't fail (I throw out the spark lead on cil 1 at idle and the car still exactly failing and with the 2,3 or 4 the car goes worst. But at high rpm I throw out any of the leads and the car goes worst so I think that at high rpm the car goes good)


Sorry for my bad english

Regards