"something that affects fuel/air mixture during warmup" - Saab 9000 Bulletin Board - Saabnet.com
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The ECU relies on readings from the coolant temperature sensor (CTS) to adjust the fuel/air mixture. I will hazard a guess that the CTS is what's wrong on your car. On my previous 9000, I had an intermittent CTS that would cause the idle to get quite high when it went into electrically "open" mode (infinite resistance) - a new sensor solved the problem. Please post the code you are getting.
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