Hmm, I dont know what to tell you. The only things I can think of would be the timing is retarded way to much, you have a clogged cat, and maybe (but very unlikely), youre missing link isnt working so your map sensor is seeing boost which sends the ecu into limp mode. Have you tried checking for codes? Sometimes a car will throw codes but not show it, so Id recommend checking for that. Sorry I couldnt be of more help.