It sounds like the T-body actually is in Limp Home Mode. There's a one-shot solenoid that connectes the throttle body directly to the throttle cable in the event of trouble. Once connected, the throttle body has to be manually reset after the code is cleared. While in warm up mode it will run okay.
Does it click and carry on when you turn the key?
To check, pull the plastic cover off the throttle body and move the throttle by hand (as if the cable is pulling it). You should NOT see the actual throttle move. If the throttle moves, that means it's in limp home mode. You will have to clear the codes and manually re-set the throttle body spring.
edit: you beat me with your last post. So much for that idea lol
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First T7 19T turbo setup. First T7 Deka 80lb. injector setup.