Why does 2003 blazer 4.3 have spark nock with premium gas?

Anonymous

∙ 17y ago

Updated: 8/16/2019

2003 blazer with a 4.3 does not need premium gas, but should not knock unless there is water in the gas or you are using ethanol based gas. It would not hurt to try a bottle of injector cleaner, I prefere Techton but others will do. also chech your air filter.

Wiki User

∙ 17y ago

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