The cable is just getting too close to the exhaust. Use something to hold it closer to the fire-wall.
Also I find that exhaust wrap isn't enough protection. You really should use a double walled exhaust header and cross over/down tube.
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There wasn't enough room to move the cable over top of the engine. I replaced it with a new one that for some reason is 1/2" shorter. So I had to move the bracket up more so the engine wouldn't idle at 2000rpms. In doing this I left enough slack to be able to have the cable sit over top of the throttle body.