My tranny just started with this issue. The sst will clutch slip when I approach to a full stop. I can tell this is not the normal downshift by the tranny itself. The car will hesitate and shakes a bit on every gear the tranny slip down to. It only happened when the tranny downshift from upper gear to lower, I would say at rpm range 15k.

I always drive the car in ss mode and never had this issue before.
Will a bad e85 having anything to do with the clutch because this tank of e85 sit in my car for 3 weeks without driving?