At this point they are considered incertae sedis;in other words, we know that they are theropods; and probably coelurosaurs; but we don't know who they are related to or how they fit into the big picture of theropod phylogeny.
Idle speed is adjusted by means of the idle control valve, which is a solenoid-operated valve that is generally automatically adjusted by a computer. One problem that can occur with this component is a loss of power (from a severed line or a short) but a more common problem is simply dirt and grime.
This part is also sometimes called Infiniti J30 Idle Valves. We stock idle control valve parts for most Infiniti models including I30, G20, QX4, Q45 and M30. We stock these Idle Control Valve brands for the Infiniti J30: Genuine, Standard Motor Products and Bosch.