There is a solid linkage between two throttle bodies. There is one TPS and one IAC. The benefit of these is that it it allows the engine to get the air it needs. It's long been known that the 2.8 or 3.4 swap could perform much better if it weren't for the airflow restriction in the neck of the Fiero intake.
With this setup, each of the two banks of cylinders has it's own air supply.