Did you backup your rooted stock rom before flashing?
If yes restore it.
If you don't have 4ext recovery, install it.
The easiest way is to use the recovery updater app.
When you install 4ext recovery with this app, you are asked if you're s-on.
If you click yes, the smart installer feature will be activated in 4ext.
This means, you don't have to flash the boot.img separately with fastboot.
If you want to install other than ICS sense roms, you have to do the wire trick to get s-off (look here
) for instructions and forget any other tutorial.
HTC Evo 3D GSM (shooteru)
Cool ICS v18 (bloat removed, "de-sensed")
HBoot: 1.49.9999 s-off (JuopunutBear)
Recovery: 4EXT Touch