The ERJ have had problems with the FADEC system. FADEC stands for Fully Automatic Digital Engine Control. I think the aircraft has four of them, so failure of one is a non-event. The FAA issued an AD (Airworthiness Directive), and the airlines were very fast to comply. Continental Express is the largest operator of Embraer jets, and American Eagle runs a distant second. As far as I know, both have addressed the problem.