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.