5K Starting Problem

[spsherm@ibm.net]

Ever since I got one of my 5KTQW it has had some unusual problems with
starting.

If the car has been sitting > 1 hour, then it is hard to start.  I have
to crank it for 5-10 secs or more.  If the engine is warm, say from just
running, it will catch in 1 sec or so.

Now that the weather is getting colder, I expected more problems, but
oddly in cold weather (~ 30F) the engine starts right up in the morning?
I had been expecting the hard start to get worse, but cold seems to make
for the opposite.

I am about to jump into this, before the weather gets too nasty, and
wanted to get some ideas from the list here, as what things to be
looking for.

I'd been thinking:

1. Leaky cold start valve, making mixture too rich (but OK in cold
weather).

2. Bad fuel pressure (but not clear why cold weather would help that). 

3. Some vacuum leak, that gets better when rubber is stiffer (the car
will still idle at 1200rpm at times).

Any thoughts, tips and alternative theories welcomed.

TIA

Steve