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symtom of faulty I A C motor (idle air control motor) this regulates the idle air to fuel ratio when at idle, when faulty dumps more fuel ,then the o2 sensors tell computor to much fuel for throttle position/ speed so computor backs off fuel almost stalls dumps fuel again and repeats. we call this hunting. because air/ fuel mixture changes idle goes up n down. im sure the dealer will gladly relieve you of lots of money.....try aftermarket or an auto wrecker may have one . careful i've seen some volvo engine parts need programing after instalation (dealer only)!!!
Have the idle air control valve checked, it might just need a cleaning, or a new one. Check all the vaccum hoses for leaks, all it takes is a pin hole to screw up the sensors.
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