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Idle problem 900 1993

I have a 1993 940T with 155,000 miles on it. I have noticed that only when I turn the A/C on my idle seems to drop everytime the A/C cycles. It drops to around 300 400 rpm's and then recovers. It happens at varing times. Whether in park or in drive, it happens sitting still. Hasnt stalled yet, but wondering it this problem could get worse. I had the A/C serviced last summer and I put in a new Idle air control valve in last october. Summer is coming so I want to nip this problem in the bud. Thanks all.







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