Rough idle in tow haul

[Predator]

Camping on the weekend notice the idle in the truck dropped to 600 rpm when stopped and has a rough idle like its going to stall when its in tow haul. When in normal mode the idle is at 700 and no rough idle any notice this with their truck

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[Geo]

Which motor do you have?

 

[Predator]

Which motor do you have?

2.7

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