Just an added warning too if the cable is fraying I guess you are talking about the metal cable, it could jam in the outer lining & stick open the butterfly valve (Throttle) hence your car will rev its head off which isnt really nice. So guys if thats the case change it.
Similarly I had my shity ole telstar snap a clutch cable on me in the middle of an intersection on town (HOW EMBARRISING)
Luckily I had ordered one and managed to run to the Ford dealer pick up the cable run back and install it all with those shity little spanners they supply in ya tool kit. I am so glad to have hydrolic in the t'rex