Car stalls when starting

My car is a 2001 Toyota carolla automatic. My car makes a shuddering noise when starting it up after it has been sitting for a couple hours. The shuddering makes the whole car shake, and if I don't push on the gas multiple times the car shuts off. When i push on the gas the car stops shuddering and I am able to drive it. But when I press on the gas when my car is having this problem I can smell something like exhaust. And when this is happening my check engine light is blinking but when I start driving my check engine light is still on but does not blink.