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I had similar symptoms with my 77 930.
Turned out to be that the front fuel pump had a mind of it's own.
The car will run fine with just the rear pressure pump working.
Take away the front suction pump, for whatever reason, and the car may take several long cranks to fire up. When it finally fires, it ran like it was only firing on 3 cylinders until the lines filled up, and the rear pump built up enough pressure.
Just because you have replaced the pumps does not mean that they are performing as designed.
Bill K
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73 911T MFI, 76 912E, 77 Turbo Carrera
Last edited by bkreigsr; 12-24-2020 at 09:37 AM..
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