# P0303 code 2010 silverado. Reoccurring **URL:** \ **Category:** Maintenance/Repairs\ **Created:** [March 17, 2014, 3:13am UTC](https://community.cartalk.com/t/p0303-code-2010-silverado-reoccurring/84216 "2014-03-17T03:13:55Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Ak\_nick](https://avatars.discourse-cdn.com/v4/letter/a/7cd45c/32.png) [@Ak\_nick](https://community.cartalk.com/u/Ak_nick)\ **Post date:** [March 17, 2014, 3:13am UTC](https://community.cartalk.com/t/p0303-code-2010-silverado-reoccurring/84216/1 "2014-03-17T03:13:55Z")
Reoccurring misfire code on cylinder 3. Changed the injector spark plug and swapped the coils from cylinder 3 and 1 ---
**Author:** ![Ak\_nick](https://avatars.discourse-cdn.com/v4/letter/a/7cd45c/32.png) [@Ak\_nick](https://community.cartalk.com/u/Ak_nick)\ **Post date:** [March 17, 2014, 3:15am UTC](https://community.cartalk.com/t/p0303-code-2010-silverado-reoccurring/84216/2 "2014-03-17T03:15:15Z")
Oh it has good compression and I run seafoam ---
**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:** [March 17, 2014, 5:58am UTC](https://community.cartalk.com/t/p0303-code-2010-silverado-reoccurring/84216/3 "2014-03-17T05:58:36Z")
Here’s some ideas Hook up a spark tester to #3 coil Hook up a noid light to #3 injector Please post back with results ---
**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\ **Post date:** [March 17, 2014, 8:10am UTC](https://community.cartalk.com/t/p0303-code-2010-silverado-reoccurring/84216/4 "2014-03-17T08:10:47Z")
What does “good” compression mean? I.e. what is the actual psi on #3? And on the others? Which engine is in it?