my car starts ruff and if i don't give it gas as i start it then it starts but dies immediatly after. Then after i drive it the car gets really hot and over heats. plus when im at a stop sign orr red light the car hesitates on going when i first go it seems like it doesn't want to go until i give it some gas then it goes but it does it again at around 40 mph i have no idea whats wrong anyone know? Could it be my cats are clogged?