Car trouble guessing game: 9-3 EditionFuture next gen S2000 owner9/28/16 6:07pmFiled to: car problemsSaabbad idle939EditPromoteShare to KinjaGo to permalinkTime for another round of collective wisdom regarding a poorly described car problem. Advertisement The car: Saab 9-3, 2007, 2.0T, autoThe symptoms: Upon start up vehicle has trouble maintaining a constant idle. For about 20 seconds it hunts. Sometimes is seems like it is about to stall but comes back up. After 20 seconds, it is gone and car idles normally. Car runs normally at all other times. This only occurs on a cold start up, mornings and sometimes in the evening on the way home from work. When running errands, symptoms to not present themselves. Forum searches do not turn up similar symptoms. Advertisement My guesses: Carbon buildup in the throttle plate.Dirty fuel injectorsMy attempts at solutionsCleaned throttle plate with throttle body cleaner and a q-tip.Added a couple bottles of Lucas fuel system treatment.Go! Sponsored For your time, an old car. I’ve really started to appreciate pre-war stuff lately.