Common problem - crank position sensor is the main culprit. The sensor goes out of calibration from heat and then goes back into an acceptable parameter once it's cooled off. A link to a Saab forum on the issue -
https://www.saabcentral.com/forums/showthread.php?t=206968
SOURCE: 1995 Saab 900 SE Convertible 2.5L V6 runs rough
Most likely air flow metre. Had same problem analysed and replaced and runs perfectly. Not cheap!
SOURCE: engine check lite saab 93 2.0l non turbo yr 2000
2005 93 1.9tdi vector sport just had the engine light on, loss of power and a whining from the engine....any ideas????
SOURCE: 2000 beetle cold start rough idle until it warms
Could be the fast idle sensor check to see that the vacume line is hooked up properly.
SOURCE: WHAT DOES ENGINE COE P502 MEANS ON A 2000 SAAB 93
The Code you're referring to should be a "P0502." What the Code signifies is: "Vehicle speed sensor circuit, low input."
SOURCE: 2002 Jeep Liberty - 3.7 Liter - Engine has begun
I would start with cleaning the throttle bore and plate. Then clean the Idle Air Control valve, IAC, as this is the device that controls idle speed. Use a can of spray carb cleaner and an old toothbrush. Trouble with the IAC would make sense if you can keep the engine going by holding down the gas pedal a bit.
Use the carb cleaner to check for vacuum leaks at hose connections and elbows. run engine and spray short bursts at hoses and listen for idle speed changes.
And lastly if problem is still there check MAP sensor.
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