Hey everyone. So I recently got my great grandfather's 84 F250 with a turbo'd 6.9 IDI running and its been idling and running really smooth. However, it has recently started to idle very rough where the whole truck is shaking. It has pretty excessive white smoke and has a strong smell of diesel from the exhaust. Once I start driving it smooths out, the smoke goes away and it has plenty of power. My guess is that I've got an injector stuck open and it's just dumping fuel when it's idling but if you guys have any ideas as to what it could be let me know!