Car lurches forward when coasting without brakes

[JgenG]

Hi Everyone,
Just wondering if anyone noticed this issue before, basically when coasting without brakes, the car sort of lurches forward. The RPMs also seem to move erratically when this happens. I used the paddle shift to display the gear and basically there was no change, in fact when it shifted from 8 to 7 it was smooth. I also haven't been to replicate it every time, usually happens when there is some gradient in the road.

 

[5.0KDM]

Check if your air box/filter is clogged.

 

[JgenG]

Check if your air box/filter is clogged.

Air filter is fine. I don't have any issues accelerating, it's smooth as ever, just coasting without brakes.

 

[JgenG]

I tried re creating the issue yesterday, I was coasting downhill and it happened again. Could it be TC issue? Or like a computer issue?

 

[5.0KDM]

I tried re creating the issue yesterday, I was coasting downhill and it happened again. Could it be TC issue? Or like a computer issue?

How many miles are on the car? It could be due for a tranny fluid flush. There's also a TSB out about harsh shifts.

 

[JgenG]

How many miles are on the car? It could be due for a tranny fluid flush. There's also a TSB out about harsh shifts.

Just hit 100,000 miles and I have done 2 drain and fills, the second one was recent, after I noticed the issue

 

[5.0KDM]

This link might be able to help you more than me. The mystery about transmission hard shift is finally revealed (TSB for HARSH 2~3, 3~4 OR 4~5 UPSHIFT)

Side note did you also change your transmission filter or just did a drain and fill.

 

[JgenG]

This link might be able to help you more than me. The mystery about transmission hard shift is finally revealed (TSB for HARSH 2~3, 3~4 OR 4~5 UPSHIFT)

Side note did you also change your transmission filter or just did a drain and fill.

The most recent one I replaced the pan with the integrated filter.
Thanks for your input