Today is around the 90s and clear skies and a baking sun. Noticed the car will stumble while idle or reverse. Would die if I didn't use 2 feet for these situations. Cruising in motion seems fine until i put the pedal down then it hesitates before kicking down. Car temp was around 220. On a day with 80s or less, the car temp is around 180 to 200F. What does this "stumble on hot days" mean? I need a better fan or radiator? Or is the gas getting to hot in the carb? Or I need a bigger mechanical fuel pump or Carb to make sure I'm getting all the gas I need?