Thanks for your theories.

> My theory is that the coolant temp sensor is sending a low resistance to
the
> ECU. The ECU thinks it's hot (but actually cold engine) so it puts out
non-rich
> mixture. This is indicated by the erratic idling on a cold engine sitting
> longer than 2 hours. To override this function just unplug this sensor
> connector then crank the motor. Watch how it runs. (The intake temp,
throttle
> sensors, etc also plays a role in fuel mixture.)

This could very easily be the problem. I think it could be that when engine
sits in
the sun engine isn't allowed to cool and computer thinks engine is hot when
infact
engine is cold. I'll trie this (but I'll connect the resistor on connector,
not just
disconnect it).
Bye the way, it isn't idling erraticly it idles perfectly when in a 1-2
seconds after
starting.

> Second theory. The cylinders or cylinder is/are experiencing a flood.
This is
> indicated by the erratic idling then clears up. To eliminate fuel or clear
up
> fuel, unplug main relay fuse (ECU or fuel pump) and crank for 10 seconds.
> Rumors (in my tech class) suggests that pressing the gas pedal to the
floor or
> in certain ways will turn off injectors for the first few seconds of
starting.

Can this theory explain why engine starts great when car hasn't been sitting
in the sun?

About idling it seems to me as if it is not enough fuel in first few cranks
in lines
(evaporated fuel in fuel lines) and when fuel gets to lines after a few
cranks
everything works great.