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I am absolutely convinced that the problem is not inside the motor.
The spark plug wires should be tested for resistance. I don't know the spec for your car, but you unhook the wire from both the distributor and the spark plug, put the ohm meter's test leads at either end, and measure the resistance in ohms. Too many or too few ohms and your wire is bad.
Motronic injectors are also mysterious to me but I'd heed Warren's caution about relieving fuel rail pressure properly before removing injectors. Since you seem to agree with the spare injector idea, you might just get one, replace #6 and see if the problem stops. Perhaps have the old injector looked at by the shop folks, if their price is reasonable.
If this does not solve the problem I'd even suspect the electrical connection, or signal, to the injector. As you can see, I think you're about to find your problem.
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'83 SC
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