07 Yukon xl w/5.3, revving motor while in park

[zrxoa1]

How many rpms should it cleanly rev to while setting in park? I think something is wrong, it stutters and shakes every so often while both idling and running down the road. Turning the ac off makes no difference.

I have ran two cans of seafoam thru and tried to rev it up while parked and it would not go past around 4k rpms.

Any of this sound familiar? Thanks!



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[phileaglesfan]

Sounds about right for park since it is an auto tranny. All of my other GM cars do the same.

Someone else can say why GM does this as I don't know.

 

[iwaslowr]

The Park rev limiter is set to 4000RPM, in the NNBS at least(My 2002 Silverado would rev to 6000RPM). If you get a custom tune this is something that can be tweaked to your liking.