2003 Subaru GT manual. When A/C is on car idles poorly and sometimes stalls, faulty A/C or engine management?
by 
Nomis 2311
ANSWERS: 2
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You could have a faulty serpententine belt, this controls your a/c as well as power steering and alternator and causing overheating issues as well. Do any of your belts make noise? A faulty blow off valve could cause similar issues if you have a turbo, any lag or unusual noise after a boost?
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I would guess engine management assuming the rough idle is simply coming from the additional stress on the idle from the engine from turning the compressor of the A/C.
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