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Rough cold idle in gear

Hagar68
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Hagar68 Enthusiast

Hagar68

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2020 GMC 2500 gas engine.

 

Starts good first of the day and idles smooth in park.  Idle becomes rough when put in reverse to back out of garage.  Smooth idle in gear after 2-3 blocks.

 

I live in the south but it does it hot or cold weather.

 

I've seen the service bulletin for cold weather starts and added the suggested additional ground to throttle body but no change.

 

Truck has only had Chevron fuel.  Has done this since new.

 

Anyone else have this issue?

 

 

E

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