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do not worry about the 23 and 24 (right now).
the 11 is in the dizzy and 42 is the fuel temp sensor
the first thinfg is to remove the cover plate for the dizzy to get tothe opti sensor and clean it..
the 42 will most likely go away when you fix the 11..
the opti sensor is positioned over and around the opti plate ..it has 360 slots in it and as the dizzy shaft turns it turns and deternmines engine timing..
the opti reader is dirty (or bad ) or the opti plate is dirty(or bad)
clean then..
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