Could be a lot of things. Check for vacuum leaks, fuel delivery problems, points, plugs, wires, rocker adjustment, carb problems, etc.
NO. It would pop and back fire.
What would cause a 76 model 350 Chevy to run bad when idling. Already replace ignition module Distributor cap and rotor
Huh?
no
Because it is a ford, buy a Chevy
Need to check the EGR valve, It sounds like it is opening to soon.
150 LBS. per cylinder. If you hace more then 15 LBS. difference between any cylinders the engine will idle rough and not run good.
no
torque converter
yes it will
Corrosion inside the distributor cap. Get a new cap and rotor.
It sounds like either a choke issue, or vapor lock. Good luck.