Re: No power !
Sounds like you more than 1 problem.
That stumbling could be the accel pump on the carb is worn out. As for no power @ the wheels either you've got an issue with your rear brakes or a problem with the transmission.
Check the transmission fluid and linkages. Also sounds like it has a serious engine issue. The only time mines been like that is when I had bent 2 valves.
XB Fairmont (street car) email@example.com.