08 Equinox, 3.6 l
While traveling on a sight incline, the auto seems to stutter and loose power, while trying to maintain speed.
Sometimes it will do this on a slight incline trying to gain speed while merging or passing.
No engine light.
The dealership says they have changed the plugs and coil packs.
I noticed that someone has put on 235/75R16 and they should be 235/65R16, throwing the speedo off about 3 mph.
Any ideas, why the car keeps stuttering?
No, I am not taking it to a speach therapist....
