doesnt stumble, it just flattens out...

 

I will say it again, a $10 digital volt meter will tell you a lot when connected to the 02 sensor. Once you see the mixture you can pass/fail that subsystem and move on. The reading should be close to one volt at the spot the engine flattens out (.8 and above) I didn't see if you are running a cat or not. If the fuel systems rich enough I would look there next, based on the rich history and now no more air pump.

 

Thanks Everyone, Ill Be Testing The Car Sunday And Will Return With Results...
To Be Continued...