I bought a 2007 Honda civic ex 5 speed with 196k miles on it. The problem is that it will either start and drive with 0 issues or it will start and die. There's also no codes in the system. I replaced the fuel pump and idk what sensors or what else I should be looking for.

 

Need to see if it's losing fuel pressure or what. If you want to throw parts at it the crank sensor is a good bet.

 

At first, I also thought it would be a fuel supply issue.
But, you replaced the fuel pump?
If you still believe it is a fuel issue then would monitor the fuel pressure to see if the pressure dies when the engine stalls.

Another cause could be due to the crank sensor. If failing then the sensor would usually prevent the engine from starting.
Checking would be to see if there is spark and fuel injector pulse.
If the sensor is not functioning then the spark and fuel injector pulse would be missing.

Can you always see the check engine light when turning the key to the run position?
If it disappears sometimes then it could mean a bad ground on the ECU?
Or even, intermittent power to the ECU?

Engine coolant temperature sensor. There are two on my 2007 CRV.
One controls the radiator fan and the other sends information to the ECU.
If the second one is faulty then it could say the engine is too hot to start and run.

Throttle body? IACV (idle air control valve)? EGR?
Just a bunch of guesses. Take with a grain of salt