I just got my camaro running and I have been driving it around getting it loosened up after sitting almost 2.5 years...

Well I was out driving around last night and my tach is way off lol according to it my idle is 3500 lol anyways when I get on it it shifts really late and kinda hard...I still havent had the courage to go WOT and let it shift at the end of the gear since it is kinda rough at 3/4 throttle

is this normal or is it because it sat for awhile? never had 700R4 car before so idk