Intermittent power loss (need help troubleshooting please)

[67 chevelle]

Originally Posted by trevarthan

The Saga continues. We rebuilt the carb. It worked for a few days, then it started stalling again. No amount of tuning would fix it. So we bought a remanufactured carb and tuned that. Still stalling.

I started suspecting it wasn't the carb at this point.

I was going through every vacuum test I could think of when it did this on the exhaust restriction test: https://youtu.be/Z_I_cT5yRos

Is it possible this has been an exhaust restriction the whole time?

Most certainly , when a catalytic converter goes ,it does this but its full time , not intermittent , the diverter valve that runs gas to your air cleaner may be causing the issue ,