So I got this car a few weeks ago and it had a weird issue where if I would kick down on the highway it would rev high and kick into gear. If I eased the throttle it'd shift normal. I wondered if it had anything to do with ETC.
I have been having random ground issues and today I came out and the car would not start - I had to tighten the battery cable where the ground connects. After fixing this, the car now has major issues when decelerating past 10mph and then giving throttle- it shudders and bangs into gear. If I start from a stop it's fine -- I don't think it's the rev and clunk issue. It's never done this particular thing before. If I engage TapShift it appears to not happen, but the downshift issue on the highway does happen.
Any insight on this? I think I will do a pan drop and shift kit and see if it goes away.