[a.graham52]

pull the upstream o2 sensor out of the exhast and see if you get your power back. thinks like "vac leak" could be exhaust pressure leaking around the manifold (if the cats clogged its gotta go somwhere). however the glowing cat could also be signs of a missfire (which could be caused by a clogged cat as well. pul lthe sensor and take it for a very quick spin. see how it acts.