Hi I have a 2001 vt 5.7 v8 automatic 4 speed i didnt use it for about 2 weeks and then i notice the gear shifting was very weird the first shift is fine then the for the second shift the engine revs up like if you step on the clutch. If i step on the gas at this point its like the car is in neutral then the gear engages it only happens when shifting for about one second if i am accelerating faster it revs up more and takes longer to engage and this happens for the third gear aswell

I checked the transmission fluid level is is ok
i tried removing the battery and reconnecting it so the computer reset but no use

can some one please help with this