My 91 Accord still has its original engine and when I checked the resistance of two different coolant temp sensors in this car: one of the sensors, by the top cooling hose feeding into the radiator and the other, just before the engine thermostat, both read over 60 million ohms (OL on meter).
This should mean that both sensors are bad since most coolant temp sensors are essentially thermistors, correct?

My 91 Accord still starts and drives well even though I have this persistent, quick pulsing idling RPM going high-low-high-low from 900 to 1900 RPM. This has been an issue for years and slowly been getting worse.
It was due to this issue that I decided to ohm those two coolant temp sensors because they're easy to get to. I isolated the sensors from the circuit by unplugging them and then ohmed them out giving me infinitely high resistance readings for both.

Anyone out there have any ideas as to whether bad coolant temp sensor(s) may be causing my idling issue and if my coolant temp sensors are indeed bad as I suspect?

Thanks in advance to anyone who replies,
Dave