Cold startup stumble

[Benjamin Kwan]

Hi,

I have a 92 100CSq and it has developed a stumble when I first start it
up in the morning.  The lights on the dash will start to illuminate like
the engine is going to stall but then it catches and seems to idle OK.  On
some occasions it does stumble when I put it in drive, but it seems to be
OK once I get moving.  This problem seems to only pop up when the car sits
for 8+ hours.

Any ideas?

Thanks.
Ben

85 4000S
92 100CSq
94 90S
01 A4tq