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You're on the right track. most of our stumbling and hesitation issues are related to vacuum leaks or spark.
Many of these cars have vacuum lines hodge-podged together like you're seeing. If you get all those lines in good shape and do an ignition refresh there's a good chance it will run like a whole different car.
The most common IMRC issue is lost bushings in the linkages below the throttle body.

Just be methodical and ask here for help if something doesn't seem right, you will get it.
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