Car sputtering on second gear, help

so awhile ago while driving the car it suddenly couldn’t accelerate and completing crapped out on me, so afterwards i replaced the timing belt thinking it was that, so now the car can start but when i gas it up on neutral it sputters and almost dies on me, the same thing happens when im in second gear too, can anyone help me out here? my dad tells me its the distributor but i wanna know what it else it could be.