Hi, I have a 172 (04 reg) that, when the air conditioning is used, cuts out, idles erratically and sounds like a tractor. If left to cold and restarted it runs perfectly until the air con is used and then it starts stalling and sounds like a diesel again. Wondering if anyone else has had this problem or similar and has any idea what might be causing it. Any help/advice much appreciated before I leave it in the hands of the garage.