We just got this vehicle they said the serpentine belt is squealing so it needs to be changed. It don't squeal all the time mainly in the mornings. Then the rpm odometer stays at 1 sometimes but when u get to a stop it idles low an cuts off but it will fire rite back up. Also u can be going down the road an sometimes it drops speed even when u are pushing gas but then it will get speed up. It shifts gears good don't over heat oil pressure is good jus had it changed. Ac don't work. Wht could be wrong with it. The man we got it from says it has been sitting for a year. No check engine light either. Don't leak any fluid.