Are you seeing any CEL codes? Typically with any VAC leak you'll get a CEL especially if it's bad enough to cause the engine to idle erratically.
Is it just a bad idle (erratic) or are you sure it's a true miss of the engine?
Did you post up video?
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-Speedy
2016 Go Mango Challenger Hellcat (PB E.T. in 1/4 Mile 9.83 @ 140MPH)
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