computer tuning is nothing no computer can tune the car
check for air leaks in the intake box/piping... maybe a clip or two have been left open or the pipe going to throttle is not on properly, leaking most of the intake air.
the car automatically adjusted the settings.. i didnt have to do anything
Am also facing the same low ldeal rpm problem in my cedia since last 2 days after battery replacement... when AC is ON then RPM increases to ideal...but not giving usual power...suggestions plz..