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Hi
I had similar problems with my -75.
A local mechanic (with a lot of 911-experience) recommended me to check/replace the injectors. I pulled the injectors and the fuel filter, and found that i had to replace most of it. I tried to clean the injectors, but the problem is that they have to be back-flushed. It can be done, but it's time consuming, and difficult to get a good result.
After replacing 4 injectors & filter, the car ran almost perfect. Further down the road i found that the ignition timing was difficult to set because the distributor shaft bushings was worn (impossible to get a stable dwell angle). It's been fixed now, and the next step would be to install a Pertronix ignitor.
Injector testing:
Buy a syringe at the local drug store. Fill it with cleaning fluid, push it firmly into the injector, and flush the injector into a glass jar
You need the injector to open and make a nice spray pattern at low pressure. You WILL feel and see the difference between good/bad injectors. Nice sunday-evening-garage-project.
Good luck
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