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At first glance, sounds like CDI box on the way out. They don't like heat when getting near death. Wonder if that is also whats giving the wacky Tach reading...
Agree with above items. My experience with a few
1. CDI - Intermittent shut down for no reason. Sometimes would start then finally no start. CDI boxes are about done after this age if original. Only time I ever needed a tow. I now keep a spare under the seat on long road trips.
2. The rev limiter relay cuts the fuel pump and can do odd things to your fuel pump power (by interrupting it) when they go bad. I have had TWO go bad (original and a used one) and they can cause behavior above (had the burbly idle one and fuel pump sounded like gravel was going through it). Simple test - unplug it; Its is the black box behind the fuel gauge with 'X' on it and white plug plugged into the bottom of it. If good again that is your issue. You can run without it you just wont have a rev limiter which is generally not an issue for normal driving.
3. O2 relay under passenger seat - unplug it and if no change that could be it (idle should go from bad to worse with that unplugged)
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Scott
1981 911SC Targa - Platinum Metallic
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