'84 245 D24 M46 runs rough/white smoke.

[auditechjs]

I recently picked up a D24 245 for cheap. 301k on it. It's my first Volvo diesel. It takes quite a while to get started, and once it runs and warms up, it will hold an idle(barely), and it runs very rough and smokes white. Smells like diesel smoke, not coolant smoke. Once it gets up to speed, you can still feel the engine running rough. Smoke isn't really noticable at highway speeds. Gas pedal is basically an on/off switch. I knew these things were slow... but not this slow. Any help would be greatly appreciated.