Partially Blocked exhaust causing 4 bbl issues

[montyman]

HI, my 85 Riv bogs when I stomp on it, but accelerates smoothly if it stays on 2 barrels. Vacumns and electronics are ok. He says it is likely a partially blocked exzhaust system.
Has anyone had this issue? Where would I start before I take it to an exhaust shop.only 20k miles on it, and the exhaust system is clean and rust free on the outside!
any help appreciated
Thanks
John

 

[MelsRegal]

Did your mechanic check the choke pull off diaphragm?
In addition to cracking the choke open it slows the opening of the secondary air valve to prevent a bog.

 

[G-827858]

Did your mechanic check the choke pull off diaphragm?
In addition to cracking the choke open it slows the opening of the secondary air valve to prevent a bog.

Thanks, I will ask him!

 

[montyman]

Hi, it appears that my catalytic convertor is likely plugged, at least thats the opinion of three old timer mechanics.
Wrenchmonkey had one for 260 canadian$, which is about what I would pay to cut it out and replace it with a pipe. I have done this before and it makes a car louder and serious exhaust smell.
Thanks!