4.0l 98 Aurora surging
My new to me 98 Aurora 4.0l works great except for one thing I've found. Sometimes, when you are cruising at 70mph -ish, the car rpm'* will shoot up for no apparent reason. It is obviously downshifting and I don't know why. It will do a few short "vroom vroom'*" up around 3500rpm then go back to where it is supposed to be. And when this happens, the cruise kicks off too. And it is sporadic. I've had it happen to me once, and my girl drove on a 180mi trip and there was about a 5min period where it was acting up as such. She said "I think the injectors need to be cleaned." I politely said "Maybe." What are your thoughts- some sort of speed sensor needing replacement maybe? It only occurs at 70mph.