I've never heard of a TV cable, but there is a Throttle Pressure cable (TP).
You adjust the TP cable at the carburator. On an older style car you loosen the locknut on the throttle linkage and get some one to push the gas pedal to the floor, then you tighten the nut.
On more modern Chevy's there is a push down lock that needs to be released using a flat blade screwdriver at the bracket where the cable is mounted. Once you release that, do the gas pedal procedure as above and push the lock back down into place. They can then release the gas pedal.
A stubby flat blade works best.
Carl M King