# 2008 Pontiac Montana SV6

**URL:** <https://community.cartalk.com/t/2008-pontiac-montana-sv6/121390>\
**Category:** Maintenance/Repairs\
**Tags:** pontiac\
**Created:** [July 20, 2018, 11:29pm UTC](https://community.cartalk.com/t/2008-pontiac-montana-sv6/121390 "2018-07-20T23:29:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![SergeDubreuil](https://avatars.discourse-cdn.com/v4/letter/s/ce7236/32.png) [@SergeDubreuil](https://community.cartalk.com/u/SergeDubreuil)\
**Post date:** [July 20, 2018, 11:29pm UTC](https://community.cartalk.com/t/2008-pontiac-montana-sv6/121390/1 "2018-07-20T23:29:56Z")

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HI! I have a montana sv6 2008 engine 3.9 lts 75000 km and  
when I drive at 1800 rpm on lock up the engine sometime  
skip 2-3 times before downshifting so had a spark plug cracked on cylinder #5 I chanded it and the problem is back  
after ± 700 kms what is it?

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**Author:** ![eddo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/eddo/32/2594_2.png) [@eddo](https://community.cartalk.com/u/eddo)\
**Post date:** [July 23, 2018, 11:28pm UTC](https://community.cartalk.com/t/2008-pontiac-montana-sv6/121390/2 "2018-07-23T23:28:23Z")

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is the spark plug cracked again?

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**Author:** ![George\_San\_Jose1](https://avatars.discourse-cdn.com/v4/letter/g/e5b9ba/32.png) [@George\_San\_Jose1](https://community.cartalk.com/u/George_San_Jose1)\
**Post date:** [July 24, 2018, 3:01am UTC](https://community.cartalk.com/t/2008-pontiac-montana-sv6/121390/3 "2018-07-24T03:01:50Z")

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Check engine light status, diagnostic codes? It sounds like an engine miss. But could be a transmission shifting problem too.