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Does the car run ok? Usually when the AMM is bad the car won't run or start. If you have a lot of intermittant hesitation at highway speeds that could indicate it is going out, provided: you checked the ignition coil, spark plugs, spark plug wires, distributer cap and rotor. AMMs are expensive (around $200). i wouldn't worry about the increased resistance between the two pins on the connector. It's not that far out of spec. If you're not having any problems, I wouldn't worry about that reading.
Make sure the fuel system is clean. I clean mine every two months by runnin it down to less than 1/4 tank and add 5 cans of injector cleaner (cheap stuff is just as good as name brand, shouldn't cost more than $5.00 total) to the tank. I drive it around till it's almost empty. That high concentration of cleaning solvent won't harm anything but it sure does get the system clean. If you've never done that before; give it a try you might be pleasantly surprised. Stay away from the cheap no-name gas (in my experience Volvo is pretty fussy about what you feed it)....most of the time it's OK but; when it's not, it's not! I'd replace the fuel filter (around $15.00) also if you can't remember when you did it last.
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