Loss of Power on my 05 trailblazer. Just changed the water pump yesterday but

What is your question?

my truck never got "hot"...I just saw water pouring out of it and replaced it. This morning, I get in it. It starts up fine and I get about 1/4 mile and a big check engine light with a downward arrow comes on and the vehicle loses power. Will not go over 10 miles an hour. Went back home and cleaned the electronic throttle control, it was very dirty but still the light is still on and the truck will not go over 20 miles per hour so I guess it helped a little...any ideas??? I can push the pedal to the floor and nothing happens, it just won't go over 20 miles per hour.