Engine surging on 79 lincoln continental town car when idled and in drive? HELP! pls?

I

Isldrsmle

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just got a 79 lincoln continental town car and gaskets for the carburetor with hoses replaced. When started, its fine. in drive its ok but when you idle in park it surges up and down for a bit then flattens out.

Can it be vaccum leak? ive been told that.

_thx!
 
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