filter post type title

add_filter('wp_insert_post_data', array(&$this, 'filter_wp_insert_post_data'), 10, 2);
        public function filter_wp_insert_post_data( $data, $postarr = array() ){
            if (is_admin()){
                if ($data['post_type'] == 'faq'){
                    $data['post_title'] = ($postarr['faq_question'] ? $postarr['faq_question'] : 'Auto Draft');
                }
            }

            return $data;
        }