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I am by far an expert on this subject. I take my 914 to a garage. But, I have had several different instances like you desrcibed when I had my 1.7 FI.
The first was a head temperature sensor that needed replacement. But, this may have been for cold starting. Worth a check though.
Second, vacuum lines were bad.
Third, pressure regulator needed adjustment once, and a new one the second time.
Fourth, water somehow got into the control unit. The car ran good until it got hot, then wanted to die. So that was replaced too. Does black smoke come out the tailpipe?
My car even got to the point where it just flat out stalled and I had to wait for it to cool off. Even after cooling off it only lasted minutes.
This is a long shot, but does your battery have enough juice? I had an old battery had enough power to start the car, but didn't have enough to provide proper spark. At least that's what the mechanic told me.
Hope that helps. Sorry if it doesn't
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