2004 Saab Aero 93T Convertible idle problem
 

My engine light had been going on and off since filling tank with Premium last week. Error code read out as a couple of misfires. It was sputtering a little at low RPM. I suspected that I may have gotten some bad gas and was trying to run it though. After warm-up the past few days I began noticing the idle RPM bouncing about 500 RPM while in Park. When I move it to Drive with the brake applied, idle RPM held steady. Engine ran normal when driving. Problem was resolved today: Repaired broken vacuum line from Intake to Aux Vacuum Pump. Replacement part #12789292 is currently not available and cannot be ordered at this time through Saab Dealers due to halt on shipments of parts from the factory.