dont forget there might be the cam timing wrong by 1 tooth or so....
same problem on any Alfa V6 / V8 and Fiat Dino V6 DOHC,
it might be possible that there happened a mistake during engine
assembly. I have seen Maserati V8s and V6 with exactly the same Problems
cam on one cylinder bank was offset for 1 tooth.
Sounds that you are driving lean during the so called "transition phase"
(between idle jet and main jet operation typically at 2600 RPM) ....there might be one or more clogged idle
jets or your idle jet screws are generally turned in too wide (by 1/4 turn) = slightly too lean....
but dont play around with those screws,
your valuable engine needs a full mixture check under load on a rolling road Dynometer
dont trust your backyard garage in this case better go to "IOZ" the only good
German located Weber carb service station: There is a lady Mrs Anette Hue she is
Germanys best expert regarding the old Weber, Solex and Dellorto carbs, you can trust her
she´s an ex race DTM mechanic mastress from Hockenheim / Nuerburgring. (No joke!) http://www.ioz.de/frontframe.html
Also VGS Cologne is a good carb specialist, but much more expensive and not (!) better than IOZ: http://www.vgsmotorsport.de/
Check float bowl level settings on those DCOE carbs...the float valves need to be
replaced any 60.000 KM especially when using the modern dry eco fuel with ethanol.
Please watch this link, it shows the DCOE float inlet needles from scrap to new condition: http://www.fiat-spider.de/phpbb3/vie...340fa2f401d3bf
Just prevent needle and carb throttle bearing wear
In Germany almost any vintage car driver adds 1% smokefree two stroke oil API TC / JASO FC
to the fuel as top lubricant, carb protection and anti corrosion additive also prevents tank rust
during winter sleep period. Its a great carb cleaner too, (works as good as seafoam)
so just add 1% two stroke oil to your fuel (its transforms todays bad dry fuel to a good classic car petrol)
as recommended by Bosch and Mercedes classic. Also works great on fuel injected K Jetronic cars.
This might clean your carb jets and valves as well
remove ash deposits between your piston rings. Most Ducati motor bike race drivers also do so.
You can get this oil very cheaply at your Kaufland supermarket for 5 Euro / one liter.
K-Classic brand yellow little plastic bottle. You wont believe how good that works.
More you can read here: http://www.carpassion.com/vintage-fe...s-obenoel.html
Check your intake manifold for air leaks between carb and socket.
Maybe the carb base screws are just loose.
Check the carb jets, often there are some jets mixed...I have seen cars with 1.50 main jets and
one wrong 1,25 (!) jet someone bastardized into the carbs....such jet mismatching can happen quite easily...
Dont trust the words of a garage saying anything is new, often nothing was done.
Sure that your ignition settings and ignition coils are okay?
Sometimes wrong spark plugs are used....only use the plug heat range Ferrari suggested for the
365 that were 12x NGK
BP7ES if my mind serves me. Maybe they recommended Golden Lodge or
Marelli plugs...but heat range should be BP7ES.
Another hint, start your engine tonight in the absolute darkness and open the hood, watch the whole ignition wiring
for electric leaks you might see lots of blue little sparks flying from the old wires to ground of the
block, often this is overlooked and the problem are shorts between cabling and ground.
Those Ferrari coils generate 40.000 Volts so wiring has to be very toughly insulated.
p.S. Never start your engine in a locked dark garage you might suffer badly under the Carbon monoxide exhaust gas
NEVER EVER DO THAT. ;-)