Q: Car won't start up after changing injectors

So i naught new injectors with four holes instead of one like the old ones. Now when i crank it once it will sorta start then shut off. So now I turn the key once or twice to add pressure then it will crank right up. With the old 1 hole injectors I could crank it without turning the key to add pressure, it would just take very long the crank but it would eventually start. I also used the turning key trick a few times with the old ones. But the old ones never started then shut off. Any way I'm assuming maybe the very cheap electric fuel pump I baught from amazon just sucks and doesn't produce enough fuel pressure for the new four hole injectors. So I'm thinking about replacing it again with a expensive one. The fuel filter is fine. I replaced it like 7 months ago. Before I changed the injectors I car would stall every now and then and sometimes would accelerate even when i floor the gas. It would sorta die on me. And i always had random misfired with new wires cap & rotor&spark plugs

My car has 280000 miles.
My car has an automatic transmission.