my del Sol would not start after it rained now won't start at all
Classic problems during wet weather are caused by old ignition wires or a cracked distributor(sp?) cap. The moisture will short out the charge going to the spark plugs. My guess is that some of your wires are worse than others, so only some of the cylinders are firing and that's why there's a loss of power even when the engine will start. When the engine gets hot enough, the water evaporates and everythings normal again. Try a new set of wires, you're probably still using the orignal set.
Search Honda Civic del Sol Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Honda Civic del Sol Experts