If it had a mismatch of idle jets, how can you be sure some others aren't mismatched?
I would do an inventory of the current jets.
If your ignition timing isn't set properly, or the distributor isn't advancing, that could be part of your issue. So could carbs being out of sync.
It's Giuseppe's giubos, not Guido's guibos, on my 78 Spider and Sport Sedan
REFRESH CONNECTIONS BEFORE REPLACING COMPONENTS