Electrical Gremlin

[Tony's 4.8]

Hi. I have an electrical gremlin with my 4.8 that has happended three times. Each time, in hot weather (and going up a steep hill), the revs start bouncing between 1500 and 1800rpm. It wont rev any harder than the 1800rpm and feels like some electrical limp mode has kicked in. I have come across others with the same issue, but to date, no one seems to have figured out the issue. Now, here is the strange part- If (when it happens) I press the 'Snow Button' beside the auto trans, or select Nueutal for a second, the problem instantly goes away for 1-2 minutes and then comes back again. Has anyone with an Automatic 4.8 had the same problem and been able to fix it ? Any help welcomed.
Regards Tony.

[the evil twin]

Steep hill as in Dirt/Gravel or Bitumen?

What I'm getting at is that it may be a glitch in the traction control and by changing modes or grabbing neutral it is 'resetting'.

Totally an outside the box hypothetical tho

[Tony's 4.8]

Thanks for the reply. It is only when going up a steep hill (at the moment), although others who have the same issue report that eventually it gets worse and starts occuring on flat ground. The car is a 2004 4.8 TI, so I dont believe there is any traction control with this year/model other than ABS brakes. Tony.

[the evil twin]

Yeah, my use of traction control is a bad term I spose given todays integrated systems.

FWIW we occasionally used Snow mode when beach launching as it reduces traction loss via the G'Box ECU shift mapping... turned 'em into a slug but sure reduced wheel spin
Your problem does sound like some sort of limp mode tho but why it snaps out of it in Snow mode or neutral is interesting
The ones in our fleet never had that issue but we turned 'em out to pasture at 80,000 K's .

Sorry but I haven't ever had a 4.8 myself so I don't have any other comments of any value