Shalom Rabbi, In the time of Avraham, Isaac and Yaakov they ate pork? It was allowed to eat pork at that time, Since the torah had not yet been given ?
Correct, since it was before the Torah was given, it was permitted for all to eat pork. We are taught however that the avos personally did keep the Torah, therefore they themselves did not eat pork. See Rashi Berieshis 26-5.