Random backfire through carb.

[ric812]

--------------UPDATE---------------

CHECKED:
CARB base - carb was not tightened down enough.
Vacuum - very steady and good vacuum
Choke and idle solenoid rewired (were not connected at all before)
Accelerator pump linkage adjusted and pump shot of fuel is going in
Timing was off - reset to 10 BTDC per emissions label


Have not checked yet:
Sparplug and compression, getting a compression gauge today.

Now I am getting a rapid popping the went up and down with rpm in 2nd and 3rd gear that will cause the engine to shut off, but it does restart easily with one press of the gas pedal. A couple of times it will go away for a minute then come back. I drove it almost a mile around the neighborhood, no faster than 40. The popping noise almost sounded like thumping and the vacuum lines did not come off this time. This only happens while driving, I can not get it to pop while sitting in the driveway.

Thank you all for the help so far.