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The RPM needle should be as steady as a rock.
This is the fun part of owning an old Volvo. Let me at it! At this point it could be anything. Good tip, the idle is changing when you apply the brakes. What I would do is check all the vacuum hoses first, STARTING with the brake booster vacuum hose and check valve. Include the vacuum hoses at the charcoal canister including the canister fitting that is plugged. Sorry, IIRC, you will have to remove the canister to get to the hose ends. From there what is the condition of the tune up parts? Plugs, wires, cap and rotor? Check the OBD codes, not that you can trust them. If you have not done this before, don't worry, you cannot break anything. Instruction are in the FAQ.
http://brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm
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