George is right a voltage drop caused the radio problem Have your starter tested sounds like it is drawing too many amps when hot Have your battery tested also It can have 12 volts but not enough amps Also check cables and starter wires for cleanliness Any corrosion put new cables on Clean posts on battery install corrosion pads on battery Check battery water Check alternator output with EVERYTHING ON Be sure all ground straps are hooked up from body to engine If you have headers you may need a heat shield for the starter If battery water was low or three years old replace it now That should give you something to do today. Most auto parts stores Auto Zone Pep Girls can check all of this for free
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