If I'm not on the throttle it just sputters and hesitates. I've changed a lot

Why were all those parts replaced? Make sure the TPS is properly clocked or the ECU will have no idea what it's reading. Copy and paste the link below, it has the steps for proper installation/setting. http://forums.nicoclub.com/ka24de-checking-tps-and-adjusting-idle-t161700.html