wow, all 5 cylinders with misfires...
Volvo's recommended order of determing cause of multiple misfires:
Compression test
Check coolant system for leaks
Check spark plug wires
Check distributor (cap AND rotor)
Ignition coil primary winding (ohmmeter between 1 and 15, .5-1.5 Ohms)
Ignition coil secondary winding (ohmmeter between 15 and output lead 8-9 Kilo Ohms
Start car (new plugs) and check voltage drop between 15 and ground, should be battery voltage.
then it gets fun: Power stage, flywheel speed, connectors, air leakage, oil level, fuel pump relay's two stage operation, fuel pressure..
If I were you, I'd stop at a pick'n'pull and snag a cap and rotor, plug wires (only because I've lost count of the times I see nice looking bougicords on the engine, and if you have to replace wires this saves you $75 or so), and the ignition coil. You'll probably be looking at 25-30 in parts from them, but I'd guess 90+% of the time its one of those things. I don't actually know how often you're supposed to replace the cap and rotor but the PO on mine did it every 2 years (at the dealer!) so I figure I'd use that interval.
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If you're not driving it "like its stolen," are you really driving?
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