Cold Start Misfire P050D

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mb1500

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2016 suburban out of warranty. P050D and P0300 codes stored. Randomly happens on cold starts on typically cold days. CEL lights up then goes off on its own. Has flashed repeatedly on other occasions, then again the light goes away. Misfire counter shows over 3,000 on cylinder 8 which is significantly more than any other cylinder.

Vehicle runs poorly when CEL flashes, otherwise runs fine. Light has stayed off for about a week now.

I’m guessing #8 needs a new injector, seems fuel related to me. Anyone have a similar problem?
 

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