Stumbling under load

1982 CJ5 4.2 liter
Replaced sending unit fuel lines, fuel pump and filter, and carburetor.
Runs fine while idling and revving it, but when driving, it stumbles and lack of power
Checked timing at 8 degrees, fuel pressure is 5.2
Not sure where the problem is and was hoping someone can help me out.

 

That is excellent fuel pressure and timing is a bit advanced. But is it a fuel or ignition issue? If this issue get worse as it warms up, put your hand on the ignition control module located underneath the coolant recovery bottle. If it is warm to the touch that means it is bad. Another problem could be from the coil located inside the distributor. You should get between 400 and 800 ohms from the orange and violet wires from the distributor. Stumbling can also be caused from a clogged accelerator pump nozzle inside the carb. It could also be from a rotted fuel line a common location for this issue is just above the fuel tank. These are just common problems with a vehicle that old.

 

Thanks for the advice have to check my distributor I do have a new carb new fuel filter and I changed all the hoses on top of gas tank And put in a new sending unit in And have to check the ignition module

 

The coil in the distributor is called a "pick up coil". BTW