What else should i do After changing the EPC solenoid in a E4OD transmission?

I have A ford bronco 1996 5.8L v8 and i just changes the epc solenoid last week and the transmission is still doing what it was doing before i replaced The solenoid.

Well still doing it then another problem. Before throwing more time and money at it find local shop at ATRA.COM for a diagnosis and go from there. If it was just a solenoid you replaced and it was behind the linkage then its a 4R70W. The E4OD the solenoid is part of a solenoid block in the back end of the transmission

Most likely the problem was never the EPC solenoid in the first place. The E4OD/4R100W transmissions had a common problem with the center support wearing into the case and causing misalignment of the intermediate drum assembly and forward clutch assembly. The forward clutch consequently suffers from loss of oil pressure and causes slippage in all forward gears, and it eventually causes total failure of the clutch along with damage and/or complete failure of all other affected components. Basically you're looking at a complete rebuild with upgraded components to have it fixed right.

Then you got other issues. Verify the connector for fluid, but first is what is it doing?