Car only running on 3 cylinders have changed out plugs with no joy, removed plug again and it was bone dry, am getting spark to plug but no fuel could it be injector or power to injector regards fran

Engine sounds like it's running on 3 cylinders wen running. Has no power. 2 3 and 4 plugs have very little spark. No check engine light...any thoughts. I started the car afta work. It was working fine til I got about 50m down the road then without warning it started missing and then loss of power.