You have two coils of wire in that sensor. One end of each coil is tied together, the other end of each coil is broken out. So you are measuring coil resistance from the common to each of the other legs.
Resistance checks rarely tell you much honestly. If the sensor looks good and has some value of resistance within a reasonable range of what the book says it's likely fine. If the sensor is open it's definitely bad or if it looks burnt or the protruding metal parts are corroded it could be bad.
If you have an oscilloscope this is a great job for one. Look at the waveforms from each coil. They should be a pretty clean sine wave. You can do this with the engine running or pull the distributor and turn it with a drill or something. Look at the waveforms at the distributor then at the ECM behind the glovebox.
These sensors rarely go out, but what I have experienced multiple times now in 80 series is the big fat blue multiconductor shielded cable that carries the distributor sensor signals to the ECM failing internally.
You can disconnect both ends of that cable from the distributor and behind the glovebox. Then use a megger to check between all conductors then to the ground shielding. In my case the cables were shorted internally to the shielding.
A potentially easier way to test it is to run a new shielded cable from the distributor to the ECM and see if the problem goes away.
Took me 2 months of on and off troubleshooting to figure this out the first time it happened to me. 2nd time was 10 minutes.
