Pull all of your spark plugs and post pics if you have a digital camera. Be prepared to replace your spark plugs before expecting to proceed with other tuneup issues and areas. Your ignition system must be in perfect shape before attempting to adjust carbs!
I strongly suggest that you plan to retrofit a Bosch CDI system to your engine ... that is what the factory did to 1969 models ... specifically to cure spark plug fouling problems!
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Warren Hall, Jr.
1973 911S Targa ... 'Annie'
1968 340S Barracuda ... 'Rolling Thunder'
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