# 2004 Chevrolet Blazer - CEL

**URL:** <https://community.cartalk.com/t/2004-chevrolet-blazer-cel/171047>\
**Category:** Maintenance/Repairs\
**Tags:** chevrolet, engines\
**Created:** [October 10, 2020, 5:47pm UTC](https://community.cartalk.com/t/2004-chevrolet-blazer-cel/171047 "2020-10-10T17:47:49Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jeanheard](https://avatars.discourse-cdn.com/v4/letter/j/c0e974/32.png) [@jeanheard](https://community.cartalk.com/u/jeanheard)\
**Post date:** [October 10, 2020, 5:47pm UTC](https://community.cartalk.com/t/2004-chevrolet-blazer-cel/171047/1 "2020-10-10T17:47:50Z")

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crank it it say check engine lights come on and it vibrates while sitting still check with auto zone it said miss in motor what is my problem

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**Author:** ![Dappersworth](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/dappersworth/32/22638_2.png) [@Dappersworth](https://community.cartalk.com/u/Dappersworth)\
**Post date:** [October 10, 2020, 5:59pm UTC](https://community.cartalk.com/t/2004-chevrolet-blazer-cel/171047/2 "2020-10-10T17:59:59Z")

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We can’t give any solid advice without the codes from the computer

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<div class="post-metadata">

**Author:** ![davepsinbox\_157004](https://avatars.discourse-cdn.com/v4/letter/d/73ab20/32.png) [@davepsinbox\_157004](https://community.cartalk.com/u/davepsinbox_157004)\
**Post date:** [October 10, 2020, 10:25pm UTC](https://community.cartalk.com/t/2004-chevrolet-blazer-cel/171047/3 "2020-10-10T22:25:34Z")

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Your best bet is to take it to an actual mechanic who can check the codes and perform a diagnosis.

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<div class="post-metadata">

**Author:** ![db4690](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/db4690/32/2583_2.png) [@db4690](https://community.cartalk.com/u/db4690)\
**Post date:** [October 11, 2020, 3:48pm UTC](https://community.cartalk.com/t/2004-chevrolet-blazer-cel/171047/4 "2020-10-11T15:48:08Z")

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P0300 random misfire, I suppose

Don’t let that “random” terminology mislead you

a smart guy will look at mode 6 data and live data and quickly realize it’s not random at all, and be able to pinpoint exactly which particular misfire is the real problem