Originally Posted by Ahabiam

Just saw the video - and yes, my first thought would be clogged exhaust... but I know how hard that is to verify. Honestly - I would go with Doug and seperate the cat where it connects to the manifold. It is really NOT that hard. 4 bolts, (Both sides of the Cat for both sides of the manifolds - 8 total.) the inside/aft (Behind the cat, and close to the engine) are a little tricky, but as long as they are not rusted too badly, they should come free. USE WD-40 or something similar. It will be loud as hell, but you will know in an hour if you have an exhaust issue or a fuel/timing problem. If the bolts wont come, strip them and/or break them - they are easily replaced, as well as the exhaust gaskets (Donuts) between the cat and the manifold.

Originally Posted by Roger Mabry

I did the temp test, the banging test and even bought the pressure
testing gauge. Still would not pass CA smog test, changed out the
Cats (was my first guess and should have just done it without all the drama of the testing = 122K miles - poor mileage and poor performance).

Then it passed the smog 100% and runs well now....