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.
29,165. That bolt changes the idle. The AAC valve opens/closes to adjust the idle when you switch on lights etc, stops it dropping down when the engine is loaded up with electrics. Warm it up, unplug the AAC valve and set the idle with the bolt. Plug the AAC valve back in.