Running rough apon starting runs very rough as it warms up it then will idle but rough

Does it run rough at hot idle ? How many miles ? Any recent work done on engine ?

Sounds like your idle valve has stopped working . Does it run fine when warmed Up? If so I would clean the throttle body and remove the idle valve and clean it. After reinstalling it have someone turn the key on while you tap the idle valve lightly with a screw driver Handel. Then see if it will idle when started. If it does then you need a new one.

A couple of possible problems, low compression on one or more cylinders, possibly a burned valve, possible headgasket leaks, have the compression tested and checked for a headgasket leak, both of these conditions would cause a rough idle and then seem to run normally when warmed up.

Leaking intake manifold (vacuum )

oxegen sensor?

The carb has a 5 minute high idle till warm. as for the running rough might try to rebuild it.

Could be the fast idle sensor check to see that the vacume line is hooked up properly.

that means could be vacuum leak

Make sure all the glow plugs are working.

if u have a damaged plug it can be running on 1 less cylinder ,it will idle very rough,change it!