Besides the idle poorly problem, the meter will blink "hold" when the car running in 1st gear (when rev in high rpm)and won't change gear,have to restart the engine to get thg go back to normal. After changed atf(valvoline decron 3), this case would appear less than before but sometimes it does.

it has a transmission problem, find a guy like me with a dealer scan tool to access that code and analyze it.