My dear Fiat lovers. Especially those with carburated cars. I'm going to give you some advice. There is only one carb to run on a Fiat 124/2000 Spider. That is a Weber DGV/DGAV Progressive two barrel carb....
It is most important to verify all linkage and levers are installed without binding and the linkage opens to full throttle and is allowed to close to the Idle Speed Screw. This is the number one and two...