Throttle position sensor replaced and still going 25 mph with REP light on.

Okay so we took out the ETC fuse and replaced it. We turned the key to the On position, did not start it and the ETC fuse kept blowing. What do we do next? Do we have to figure out which wire is blown? Do we have the take the key ignition apart to look at the wires?

No - inspect wiring at throttle body and the wiring connector. That is likely where this all began anyway - now there is a short circuit .. Just have to search for it. Concentrate on the area you where have been working..