Trouble getting the fuel rail to disconnect

I am removing my engine. Got everything off except for the fuel rail. Its mostly out of the way now since I removed the injectors and pulled the rail off to the side. But sure would like to remove it. I have that disconnect tool for removing the fuel rail and AC connections. I have the plastic ones and the metal ones. No matter how hard I try to get that bugger to let go, I can't get it. It slides in and "Seems" to unlatch but it just doesn't let go. How do you do it? Help !

What year, What engine?

1999, 2.2L Nothing special, just won't let go.