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I would remove, inspect and clean the rotor and distributor cap. This is a very common damp start problem.
I suspect that you may have two problems, take on the damp start first.
I remove the cap and rotor and scrape any burnt material off the brass contacts in the distributor cap and on the tip of the rotor. True mechanics do this with the sharpened end of an ignition file. (In the 50s, one did this at least twice a year!) You can sand them smooth after scraping. I sometimes use an emery board.
On the rotor, clean the top, use an eraser if it is not too bad, clean with solvent after that. Check to see if the carbon thingie in the center of the rotor still moves freely, and touch it a bit with sand paper to expose a fresh surface, do not wear it down. Look inside all the holes in the distributor cap to make sure they are not corroded.
If your distributor cap has a black plastic splash guard on it, remomove it - it is composed of two pieces. After the dirt gets under this guard, it causes more trouble than it does good. Clean all the dirt off the outside of the cap and check carefully for cracks. Clean the oil from the inside. I use a clean rag and some WD 40 for this.
Reinstall the parts (Make sure that the plug wires are in their keepers, and adjust them so that they are not touching the engine - if you can, keep them apart from each other as well) and wait for a rainy day. You might try to start your brick in the dark, on a damp night. Open your brick's hood and have an assistant watch for sparks on the ignition parts.
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96 855R, 95 855,854, 90 744 Ti - 343,000 Volvo miles put on 7 bricks
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