I think what he is trying to say is...when he starts the engine it runs. When he tries to step on the gas instead of it reving up to rev limiter, he hits the limp mode limiter which should be 3000 - 3500 rpms.

If what I am saying is correct, then you ARE throwing a code/codes and before anyone can help you, you need to find out what they are. There are only a few things that will throw you into limp mode and they are all electrical.