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Not sure what the exact question is.
These years are always tough as things were changing so much. But assuming the car has EA (e-gas, or a throttle motor in other words), there are a couple switches internal to the throttle motor, so more than likely a switch that closes when the throttle flap is at idle. I can see where if there were a problem with that switch or it's wiring (a-hem), that you could get a weird idle like you earlier said the car has a problem with. ALTHOUGH there may be a switch on the throttle PEDAL which could cause a problem as well, most EA cars do have this, inside the car on or above the pedal.
In regards to the stop lamp code, IF you drive the car please make sure the stop lamps are working, but these pin 14 codes could all be related, and related to lousy rotten wiring on the engine harness. NOT hard to do a quick inspection yourself for signs of cracking wiring insulation, plus you could almost rest assured that an engine harness will fix the problems. The rotten wiring is no reason to pass on the car, with some coaching you might be able to DIY it. I love those 124 coupes, the sportline is an especially rare bird.
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