throttle cable is unrelated to the speedo cable
86-92 trans ams and firebirds have an electric vehicle speed sensor, (90-92) camaros have vss) so therefore no speedo cable. signal goes to ecm, then to gauge.
check the mounting point of the gas pedal to make sure nothing broke or shifted, since it is just plastic.
also check the spring on the throttle body to make sure its fully intact and not damaged, after all that, id suggest swapping out the throttle cable and going from there.
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