suggestion:with a 103 engine its best to be assured that the OVP and FPR relays are in perfect condition for further diagnosis ,very best is to have new units,same holds good for all the fuses , new brass type.These three ageing components do cause weird symptoms in the CIS -E ,from there on you may check for a leaky injectors including the cold start one and temperature sensor.
Is the fuel accumulator new?
regards

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