Left bank is running lean...
When Sway is under the Ferrari, as Memphis approaches he says, "Sounds like the left bank is running lean."
You can hear the engine of the (a?) car revving and then shutting off, as she rolls the creeper out from under the car.
I'm not a mechanic, so don't know a lot about cars, and even less about Ferraris, but it seems odd Sway would be on a creeper under the car working on a running engine. I know you can start an engine with a remote, but why she would be working on the intake / ignition / carburetion (since Memphis mentions it is "running lean", that would be where the trouble would lie) from under the car makes little sense.
It makes even less sense that she would be able to "rev" the engine from down there. Throttle linkages would be very difficult to reach between the exhaust manifold(s), fender, firewall, etc. This might be different if it were an inline engine or transverse mounted, but since Memphis says "left bank", that indicates it's a longitudinally-mounted "V" engine.
It makes sense that, if the engine is running, the mechanic would have their head under the hood, not under the whole car.