# Rough running Saab fixed itself

**URL:** <https://community.cartalk.com/t/rough-running-saab-fixed-itself/69132>\
**Category:** Maintenance/Repairs\
**Tags:** saab, 9-3\
**Created:** [November 1, 2011, 1:06am UTC](https://community.cartalk.com/t/rough-running-saab-fixed-itself/69132 "2011-11-01T01:06:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Chris23](https://avatars.discourse-cdn.com/v4/letter/c/c5a1d2/32.png) [@Chris23](https://community.cartalk.com/u/Chris23)\
**Post date:** [November 1, 2011, 1:06am UTC](https://community.cartalk.com/t/rough-running-saab-fixed-itself/69132/1 "2011-11-01T01:06:16Z")

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Car was idling and driving real rough and dying at stops. Turns out that the transmission mount was torn so I replaced  
it and verified that the other two motor mounts were good. Car was still running rough but on a drive with some jerky shifts (automatic) after about 20 miles all is well and I’m running as smooth as a baby’s bottom with great turbo action. Cars just don’t fix themselves. What could have been wrong? By the way there were no codes from the Tech ll. Using a pc of tubing I can’t hear any vacuum leaks nor when spraying brake cleaner on the hose ends does the engine race.

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**Author:** ![Triedaq](https://avatars.discourse-cdn.com/v4/letter/t/65b543/32.png) [@Triedaq](https://community.cartalk.com/u/Triedaq)\
**Post date:** [November 1, 2011, 1:12am UTC](https://community.cartalk.com/t/rough-running-saab-fixed-itself/69132/2 "2011-11-01T01:12:00Z")

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I don’t believe that the torn transmission mount and the rough running engine were related. I wonder if you picked up a tank of gasoline that was bad. It’s rare, but it has happened.

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**Author:** ![common-sense-answer](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/common-sense-answer/32/716_2.png) [@common-sense-answer](https://community.cartalk.com/u/common-sense-answer)\
**Post date:** [November 1, 2011, 12:13pm UTC](https://community.cartalk.com/t/rough-running-saab-fixed-itself/69132/3 "2011-11-01T12:13:20Z")

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**_Saab 9-3  
Model-Year ?_**

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**Author:** ![Chris23](https://avatars.discourse-cdn.com/v4/letter/c/c5a1d2/32.png) [@Chris23](https://community.cartalk.com/u/Chris23)\
**Post date:** [November 1, 2011, 3:06pm UTC](https://community.cartalk.com/t/rough-running-saab-fixed-itself/69132/4 "2011-11-01T15:06:16Z")

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This is a 1999 2.0L turbo.  
About two weeks prior to the rough running for no good reason other than annual maintence I added a container 6oz? of Gumout fuel injector cleaner to a full tank of gas and there were two weeks of good running after that pior to the rough running.  
During the rough running I replaced the spark plugs with the proper NGK pulg gapped to the recommended 1.0mm. Prior to the rough running there was an O2 sensor resistance high code, so i replaced the 02 sensor with a new one. This did not immediately eliminate the rough running.