The stock set-up and jetting of the 914-6 carbs was far from perfect ... and hot weather drivability problems were common when they were new! Are these problems worse in hot weather? The 914-6 typically ran 20° F hotter than a 911T with the same engine! Do you have any idea what temps your oil is running?
If it was me, I would try larger main and idle jets ... 125 - 135 on the mains and 60 - 65 idle jets.
Which NGK spark plugs are you running?
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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