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Sorry, I missed your 1600rpm idle speed info, thats way high. I think an alternator starts putting out current at around 1000/1200rpm so I would think any voltage drop from having the lights on would be compensated for well before 1600rpm. I am no CIS expert but there may be a clue that its only an issue when the car is warmed up (leaned out from any cold start circuit) and the lights are on. If its not an issue when the car is cold and the lights are on then it sounds like its only getting too lean at normal operating temp causing the oscillating/ stalling. I can see why you suspect a voltage issue, can you put a DVM across the 12V to see whats happening?
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1972 911T Coupe with a '73E MFI engine and 'S' pistons
10 year resto mostly completed, in original Albert Blue.
***If only I didn't know now what I didn't know then***
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