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p0300 code 03 silverado

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Old 03-12-2017, 02:01 PM
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Vacuum test will also tell you whether its a restricted exhaust as well...
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Old 03-16-2017, 08:29 PM
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Originally Posted by blue5three
So I drove it to work today but I didn't pass 2k rpms n didn't shake it might be the cats, on my day off ima take them off and look in there see how they look.. if they are bad I'll just buy some lt headers and put them in there
Have you unplugged each coil to check for Spark? Always the first and easiest check for a P0300. Just had one go tips up on me last week as a matter of fact.
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