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"In trying to troubleshoot my continuing intermittent acceleration lag (which is resolved by turning off and restarting the car)"
IMO, your Volvo/Chrysler Ignition system is perhaps the most reliable thing under the hood. I think your fix (turning off and restarting the car) is leading you astray -- and it could be temporarily "fixing" a catalytic converter problem, rather than doing anything to the ignition.
I had an '87 240 whose cat "guts" came loose and, with time and vibration, the debris formed a compact ball of scrap about 2.5" in diameter.
Under varying conditions of accelleration and terrain, this "cat ball" would roll back and plug the cat outlet, producing much the same symptoms as you describe.
When the car stopped (or sometimes under braking deceleration), the ball rolled forward again, freeing the exhaust, and all was well till the next time.
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Bruce Young '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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