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1984 Charger issue?

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Hi all.

I have the opportunity to purchase an 84 charger from the original owner. Reportedly 73k miles. The seller says that is has a rough idle. It has the 2.2, but I'm not familiar with that one. I had a 600 with the turbo 2.2, but only for 5 days...

Does anyone know off the top of their head what could cause rough idle?