Sr20det boost issues

[Turb]

Okay so I've had this sr20det s13 for a little while now, when I first got it it seemed like it had a bad turbo when I got into boost about 3k it seemed like it just didn't boost at all, had no power! Soooo I just put the new turbo in because I thought the turbo was bad, which it was completely blown but after just getting the new turbo in and everything hooked up still feels like it doesn't have much power, as well as it idle's a little high at 1500, I can hear the turbo spool up fine and has brand new gaskets so it shouldn't be leaking from their, idk any help would be great thanks!