BMW M30b32 2x Weber 32/36 rough idle and revv 

'81 733i E23
2x Weber 32/36 asynchronous carbs
L Jetronic Electronic distributor is retained
Open headers. Old style US market manifold with 1 big output.
Engine was warm when revved, ignition timing was seat of the pants done by ear. Carbs are jetted but the mixture is still a little off.