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Sounds MAF related to me. Try cleaning it. You could also unplug it to see if it runs better. Be aware that when you unplug it the car will throw a CEL because it is unplugged. I'm not sure if the CEL will clear itself when you plug it back in or if you will have to clear it with a OBD II reader.
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1998 Porsche 986
Threaded Mode
