[CGGorman]

It sounds to me like the injectors or A/C compressor. Can't do anything about that, really. Shut off the climate controll and see if the noise goes away. The injector tick is always present whenever the engine runs. Check your hood sealing surfaces for missing gaskets/weatherstrip and also for missing insulation. If any of these things are missing, the sound can escape the engine bay easier and make it seem louder.

If it goes away once the car is warmed up, it could be the exhaust manifold. If so, it would need to be replaced to eliminate the tick.

I doubt it's pre-ignition (engine knock), since it happens at idle...but you never know. What fuel are you running? It should be at least 91 octane. If you suspect it might be pre-ignition, you should run out the tank and pour a bottle of fuel system cleaner in the tank before refilling with 91+ octane fuel.

Lastly (but doubtful, since the car sounds driveable), it could be low fuel pressure caused by blockage at the inlets or filters or bad pump(s).