idle different every day help ?

[chads69]

I just got a new 350 with a good size cam from a friend, I had them swapped tweak the timing
the carb got the truck running sweat. the next day started the truck and it did nit want to idle
it was running rich so went threw the same process a day or to later it did the same thing
a friend said it acts like the carb is loading up so I went and bought a new carb set it up
and again a day later the same now its been 2-3 weeks of this B.S. can some one
PLEASE HELP I am starting not to love my 69 c10 short bed.

[WRENCHD]

check the base plate and intake for vac leaks. did the engine back fire and then this started to happen? recheck the timming and see if the dist is lose, it may have moved if lose
dave