The first number (3) is always a tricky one and is probably
a code 12 (battery
recently disconnected or PCM memory lost).
The next one (43) can have multiple meanings including misfire or ignition coil
control circuit codes.
Code 24 is a throttle position sensor (TPS) issue, but also has multiple meanings with the flash code method. It's also quite possible that the code 24 was set accidentally while you worked in the area... hard to say.
Finally, code 55 means end-of-test... you will always get that one.
The code 24 won't cause steady speed or idle stalling, so we can disregard that for now.
Code 43 is another matter, but because of the vague nature of flash codes in this year, we're left with more questions. I'd explore the possibility of a loose terminal at the ignition coil at this point, something that most certainly happens on these units. If you can reach the coil connector with the engine running, wiggle it lightly while watching for a reaction. This places you very close to a dangerous area, so you might consider using a tool of some sort to reach in there... not your arm. I prefer to come in from the inside of the vehicle where you have good access to the coil without the rotating blades of death.
A loose coil terminal in the connector can cause the type of stalling you've experienced... either sharp and DONE or a prolonged stumble/ backfire situation. Check it out and let me know if we need to keep looking.