Since this site has been so helpful in keeping my V70 on the road, I though I should provide a complete summary of a rather insidious problem that's finally been solved:

Problem - Car takes several seconds to start and produces a very 'rich' odor out of the tail pipe at startup. Cranking is strong, but engine just won't kick in as fast as it did for the first 70k miles. CheckEngine ight stays on. (Code is Misfire on Cylinder 1.)

Hypotheses -
1. Bad plugs/wires. Shop replaced them. Shop also spent wayyy too much time _not_ figuring out what the problem is. After many years of good service from them, I've called it quits, because I think they should have notifed me prior to spending 3 full days playing guessing games. (Their conclusion was "we don't know" for $600.)
2. Bad check valve in fuel pump. I knew that I was losing fuel pressure when the car sat idle (45lb -> 0 in less than 1 hour). I ruled out the check-valve by 'pre-starting' the car several times prior to trying to starting it. By turning the key from the full 'off' position to the 'click' right before the starter engages, the fuel pump is turned on for a short period of time. If you do this a few times in a row, the fuel line should be pressurized.
2. Leaky/stuck fuel injector(s). I was learly of touching the fuel system myself, so I went to another shop. For $150, they pulled the fuel rail and reported that 4 of the 5 injectors were 'dribbling' fuel after the engine was shut off. For an addition $250, they hooked the injectors up to some kind of injector cleaner machine. Starting was great for about 1 day; then problem returned.
3. Bad fuel injector. Shop pulled injectors again, and found the injector #1 was still leaking badly. Replaced it. (another $300+)

Starting is great now. (However, my air pump died 5 days later; that's another story.) The lesson here, I think, is that my OBD-II was reporting a misfire on cylinder 1 all along. I could have saved a lot of $ by simply replacing the #1 injector (which turned out to be the culprit) myself.

I think the leaker injector caused a bunch of fuel to collect in the intake manifold as the car sat idle. At startup, the mixture was _way_ too rich until a few seconds of cranking had pumped enough fresh air in.