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Yet another P0300 DTC corrected

thx1138v2
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thx1138v2 Enthusiast

thx1138v2

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Posted

2007 GMC Sierra C1500 4.3L Classic

 

The code is "Multiple cylinder misfire."

 

This one turned out to be a loose connection in the 3-pin connector on the ignition coil. It was driving me crazy with many different fixes that would last a day or 2 and revert back to the misfire and stalling.

 

So check the coil connector first to either fix it or rule it out.

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