Hi guys new to the forum so excuse me if I get anything wrong. I have a 2001 3.3 auto grand voyager that I purchased the weekend with a fault allegedly of hunting/surging, when I test drive the car couldn't find the fault but only got to 50mph but thought it was revving high and seemed as if it wasn't changing up but then again thought it might be me as my old 1998 3.3 auto was a bit notchy changing up so thought it was just smoother and nice. Oh how wrong was I as paid the money drove onto a dual carriage way and it stayed in what I thought was 3rd doing 50mph maybe 55mph at 4500rpm ish at 60mph it started what I can only describe as surging / kangaroo effect down the road .tried cruise control and exactly the same but at 45mph even though revs are high as its not changing up it doesn't surge or kangaroo. I tried manually selecting 3rd but it didn't change so I'm thinking it's stuck in 2nd it goes in p r and d instantly but won't change up any ideas please as I've got it for Xmas pressy for the wife and it looks nice but she can't drive it as it is. There are no dash lights up.please help as I really want to fix it but don't really no where to start my diagnosis thanks guys regards paul

 

ignore comment, wrong post. Apologies