Thanks for the response, but initially i got a new MAF, and changed the AC Copmressor, when im in motion and tend to apply the brakes, i get a strong vibration like jerking immediately i apply the brake it stops. did scan and got cylinder misfire, 123456 not working. my mechanic suggested removing the top cylinder and grind the valve. the other said its fuel pump and MAF. just very confused and these parts dont copme cheap.