Throttle cable Instalation/Removal

DOES ANYBODY KNOW HOW THE HELL I GET IT OFF!!!!...I cant get the conection off where it goes thro the firewall behind the gas pedel.....I need help!!!!

does it pass through a rubber groment, or is it a plastic clip type thing? it could be bolted in behind gas pedal, might need to remove it. do you already have the new cable? look at it in the spot where it goes through the bulkhead(firewall).