Fred's Mexican Cafe - S San Diego

Can anyone tell me if there is an authentic Mexican restaurant in San Diego? Inspite of the close proximity to the border I have had the worst luck finding good Mexican food not for American taste buds. As for Fred's this place is fine except for the food. They have three different salsas none of them any good. The chicken fajitas were fine but I'm looking for better. I've been to old town and the food there is mediocre at best. HELP!!