[s-cars] Rough 'cold start' idle? & Revs drop when Air Con switched on?

[Gary Bray]

I've just started the 'initial sortout' on a recently purchased '92, UK
spec S4.

x2 irritating problems .....

[1] From cold she starts on the button but will not idle smoothly 'til
she begins to come up to temperature (a minute or two?).

[2] At all times (most notable at idle), switch on the Air Con and
engine revs' drop 200/300RPM.

Anyone hot on instant fixes?!

Regards to all,

Gary