He did say that he cleaned the MAF and cleaning a dirty MAF gets it working like a clean MAF should, cleaning doesn't fix a bad MAF and these things do go bad.
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Thanks for setting me straight!
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OP, I didn't see you mention the O2 sensor (fuel/air ratio sensor).
The MAF sensor measures the airflow into the engine, the fuel/air ratio sensor measures the combustion efficiency and the ECU adjusts the fuel trim accordingly.
Your problem is probably a bad O2 sensor. However, before you replace it make sure there are no air leaks between the MAF and the intake manifold and check the two large o-rings at the throttle body. Also look for exhaust leaks upstream of the O2 sensor. If that all checks out, replace the O2 sensor. Buy a Saab OEM sensor, no aftermarket.
Final thing to do after that if still no joy is install a new OEM MAF sensor.
Hows tire pressure?
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I would only get the recommended platinum plugs. I tried something along the lines of iridium and did not get better results at all. Quality tires and air pressure helps too. Also check your vaccum lines and connections