Did you pull the plugs after it ran a bit to confirm it's dumping fuel? They'd be wet if it is. Are you sure you've got spark to the cylinders in question? If you've got spark and it's wet with fuel then it an oring or injector. Pull intake and reattach fuel lines to rail. Pressurize and look for drips. Note if drip come from injector tip or around injector/fuel rail.