idle problems

Slight emergency regarding my timeframe here, have done some searching but thought I would toss out the specific symptoms and see if anyone is familiar with them. Car is a 2000 9-3 5-spd base model. Yesterday, responded POV to a fire department call and left my engine running with red lights on...

So when I start my 1990 900 spg cold, the revs stay relatively low but still around 1,100. As the car warms up it can sometimes get as high as 2,100 but almost always stays around 1,700 once the engines been running. Also, I can't confirm this entirely or even know if this relates to the...

I have a manual transmission 98 900s Turbo. The problem I'm having is that when I turn on the air conditioner or heater, the engine revs up to about 3k and then drops back down to 2k and back up and down like that until I turn the A/C off. The interval of the revs is fairly momentary, almost...