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Rumble 'Dieseling' at Low Idle - '82 240 w/ B21 F and Chrysler Ignition 200 1982

I have a 1982 240 with B21F and the Chrysler electronic ignition. I only have
70,000 on the engine as it was is storage while I was overseas. No problems
with starting, cruising or normal driving, but when at idle it makes a
"dieseling" sound/rumble as RPM's fall off and then pick back up. Had the car serviced by Volvo upon return to service and they gave it clean bill of health. Any obvious things I should check before paying a pro ?






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