1990 Acura Integra won't turn over

I have a 1990 acura integra LS that I bought and drove it home and I parked in front of my house the next day I got in my car and tried to start up my car it died!
it wouldn't start so I thought it was my timming
so I got a new timming belt and timed it yet it wouldn't start so I went and bought a new cap and spark plugs yet it still won't start so I change battery
and yet it still won't start so I took out the fuel injectors and check it and I put it back in but it still won't start so I don't know what to do now
can it be the relay or something eils please if u know the problem please tell me so I can fix it.