No acceleration, RPMs will not exceed 2,000?

Hi all,

I am having trouble with my vehicle listed above 258 automatic. I had to adjust the carburetor and timing to get vehicle to pass emissions. It passed, but they sure drove it hard and on the way home something happened. I'm not sure what, but I lost virtually all acceleration in a moment. All of a sudden, no guts and a very choking sound. I could barely get up the slight hill and back to the house.

Subsequently I have worked re-adjusted the carburetor and timing and the car idles great, but once the RPMs reach about 1,800 it starts to gasp - and really struggles to get RPMs any higher than that. This happens in both neutral and when driving. When driving there is no acceleration (or power) - I can barely get it out of first gear (automatic). Anytime the carburetor is opened up (let alone WOT) it peaks out and I start to get almost a back flow sound. I have attached a video for reference. (Shown in first reply). Very throaty, almost choking sound. Just bogs down.

I've replaced the fuel filter, replaced oil pressure sensor, replaced distributor cap (only cap) and checked for any major vacuum leaks (none) not saying there isn't something leaking under the exhaust manifold, but I just can't get there to check. Checked temperature on catalytic converter and it doesn't seem to be blocked. No oil leaks, no back flow air into the radiator (no bubbles). Doesn't seem to be any missing or depleting radiator fluid (haven't driven much since incident) and not leaking that I can discern around manifolds or head gasket.


Thoughts? Thanks for all your help!