<crossposted to other group>

Toothbrush, lint-free rag, throttle body cleaner.

Put brick on gas pedal or something to keep pedal on floor.
Spray cleaner on brush, then scrub all traces of carbon from all surfaces
in throttle body.
Dry off brush. Wrap rag around brush, use that to wipe away scrubbed
carbon. Repeat until shiny clean everywhere.
Do not spray into orifices in throttle body.

Remove brick. Start car.
While car is idling (COLD), spray cleaner into TB orifices in a few short
bursts, allowing the engine time to stumble and recover. Too much may drown
it.

Check for oil in air cleaner hose. If present, spray copious amounts of
cleaner down it to get rid of the oil. Let dry (do not wipe!), reinstall.