In TU, go to Advance tab and uncheck "Set Hosts to Cydia on Exit" option. Apply, close out TU, then reboot.
Also check your hosts file after reboot to see if sauriks server is still on the log. If its still there, open the hosts file with admin permissions using notepad or some type of text editor and remove sauriks server. Then reboot again. Then try restoring back to 4.2.8 .
If you are still stuck in the recovery boot loop cycle after using the above methods i listed, try TU to kick it out of recovery.
If that fails, try running your JB program while its in recovery bootloop. Currently all JB programs for 4.2.x/4.3.x require DFU so being in bootloop is not an issue. The JB program should kick you out of bootloop.