Display works fine

dash icons started blinking--especially stabilizer symbol for 1-2 minutes. Then they stopped for a while but did same within 45 minutes or so. WHY???

This is a 2012 Escalade just cake from a customer who leased it and only has 28000 miles on it. No service light is on but I've had it for 2 weeks and when I accelerate it hesitates and sometimes chuggs. And when it's slows down it sometimes it's having a hard time slowing down. What is going on?