1985 Dodge Ram runs rough and stalls at idle.

There is a carb problem as you discribe it runs too rich and when it warms up some the engine can't handle all that extra fuel and stalls. Blows black smoke out the exhaust? do the exhaust manfolds leak at the cylinder head connection and or worse is the manifold cracked? The EGR valve sounds possible as the valve being partly open will make it do what you say. A thin peice of medal can be cut with sissors and put between the EGR and it's manifold and then tighten down will stop that leak. If it runs good then replace the EGR , or run it like that if you don't have to face a safty lane inspection. The PCV valve can do this too and or a hole or crack in it's hose. Remove it from the vale cover and let it hang in the end of the hose. If it runs OK now the oil has been gassed when you were having you carb trobles and as the oil heats up it fumes enoght to make the engine choke on the extra fumes of fuel. You don't nee to change the plugs if you don't want to but you should check them and maybe tourch them off with a propane tourch to clean off soot and other grime that comes from a motor thats not running right. Bet gas in the oil. Fuel pump can leak gas into the oil also. More oftem than you might think and still work.