2020 3.5EB idle shudder

[20ebpruitt]

I recently obtained a 2020 f150 limited with the 3.5EB HO engine, I've noticed at idle it runs smooth smooth shudder, and this repeats every few seconds or so. But tach is staying approx. 550rpm. Is this normal? I will try 93octane on the next fill up, and have tried the mentioned in other threads way of idle relearn to no avail, ideas thoughts? Thanks in advance

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[adyaro77]

My last two 3.5's did the same thing. Was never an issue.

 

[dbtgt]

My 2021 3.5L EB does it.
It is normal behavior for the 3.5L EB engines.

 

[Ricksc]

My 2017 and 22 both do it.

 

[Tone]

Went away with 91 octane, even better with 93.

With 87, it sounded like an overloaded washing machine.

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