turns off when idling only with A/C on

Hello, my car is a HDI diesel. It turns off stalls only with a/C on at idling. i mean when the A/C on the cars start to choke and gradually it turns off at idling . i replaced the timing belt water pump and pulleys. they told me it was alternator fault. checked it and was fine. i think is throttle body or fuel pump or fuel pump regulator. when i first turn on the car when it has been a while off, in the morning for example the car makes a click sound about four or five clicks and a smell of diesel gasoline is out, but only for five minutes max not disturbing. when i come from work and turn off i hear again the four or five clicks.
Thanks, best regards