N15 Si injection question

Hello, i have a nissan almera 1.4 of year 1997, and i recently started having problems with the injection. When the car is cold it performs fine, when it reaches normal running temperatures, it stops working if the gas is not pressed. The engineer told me a part that is responsible for giving air to the injection is not working (it is an electric part according to what he said) and needs to be replaced. The part costs almost 1000 euros, half the price of the car. I need to find a spare part from a used almera and i don't know what the name of the part is to look for it. I live in geneva and he said a strange name in french but i did not understand correctly and now i can't find what i am looking for. Could someone please tell me any suggestions on what should i look for?
Thanks in advance
 
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