1995 4Runner started without coolant

Hey everyone,
I was flushing the radiator on my 1995 V6, 3 Liter, 5 speed. And absent mindedly, I fired up the engine for a minute to "flush" it out, but hadn't put the water/flush in it yet.

Now, the check engine light is on, it idles at about 2000 RPMs and spits smoke. I haven't run it more than 5 minutes total like this. I refilled the radiator, fired it up, no better. I drained that and tried again, but still no better.

What can I do?

I really appreciate any response,
Thanks,
~ David

Check the cylinder compression.