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It seems like the two codes are closely related. P1128 is "Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold".
Start by checking your vacuum hoses for leaks or cuts on the 1-3 side of the engine and move to the other side if you find none. Keep checking the codes each day you drive it and see if any others pop up.
If there are no vacuum leaks, it's probably a sensor. More likely an O2 sensor, but could be MAF.
Do you have an oiled air filter or stock? The oiled ones can cause big problems for the MAF if they are not oiled perfectly.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
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