nissan sr20det ecu coolant sensor s13

was wondering if any one else had a simliar problem

started my car had a rough idle (hard start) let it warm up idle didnt change and when i rev'ed it (stepped on the gas) the coolant gauge dropped down to cold when it was released it when back up to warm could seem like it was getting to much gas no leaks on the fuel fpr is steady could this be the coolant sensor thanks

names dashan email lshot19@aim.com