Tc converter problems?

[BigWig]

Alright guys I need some help.I recently installed a new converter and valvebody,and seem to have some problems.Tranny shifts ok at wot but at light throttle when going into overdrive the converter starts to shutter.I also had a code pop up for low line pressure. Anyone got any ideas?

 

[dangerous06]

Sounds like a valve body issue I would call the guy you got it from !