okay so ive noticed that when im driving, going into overdrive the rpms seem to jump a bit. When im doing about 79 or 80 kmh and it shifts into overdrive, instead of dropping down to 1500rpm it goes up to about 2200-2300 then drops to 1600 then goes back up to about 1800-1900 then drops to 1500 and stays there. I have no hard shifts in any gears even when tranny is warm. Previous owner had the transmission rebuilt 6 years ago aswell. I found out that if i lift off the gas it will instantly drop to 1500 and i can go from there. There are no codes found other than the fuel level sensor. Hoping someone can shed some light on this

 

sounds like its slipping, if the engine is running away

 

well thing is when it does that the car is still accelerating so im not sure :p

 

It still sounds like its slipping, or it could be some kind of sensor issue

 

Check the TPS or the IAC before Id consider a trans issue...
I had a vehicle that was doing the very same thing...it turned out to be the TPS...
Yet it wasnt throwing any codes...

 

Ok, how would i be able to check if the TPS or IAC are bad? Also if the TPS was bad wouldnt i be getting terrible mileage and bad throttle response? Im constantly getting 9.3-9.7 l/100km so im dong pretty well for gas mileage

 

I too was still getting excellent fuel mileage..
Even the dealer couldnt figure it out....
I figured it out by happenstance..(process of elimination)
Just thought id pass the info along....
Try cleaning the TPS,... and reinstahl it...I ended up purchaseing a new TPS and problem solved...
Hope this helps!