Allrite guys here the update .After researching all night i fixed my rpm problem and yes i did reset the computer (ECU) the proper way at home .So this how i did it
1.disconnected the neg terminal .
2.Take a wire and touch one end of the neg ter and one end of the positive ter for about 10 secs
3.leave the car terminal off for about 20 mins but i left it for 30 mins since i started compounding my right fender .
4.attach the terminal back and wait a 2 mins before the next step .
5.put the key in the ignition 2 but dont start it leave it for about 10 sec so that the computer can get ready to fuction.
6.and then finally start the car with every electrical thing off .
- leave it start for about 20 min so that the ecu can feed all the data .when the fan starts everything is back to its factory position .
my rpm are back to where is suppose to be ....
so happy ab sonay laga hoo good night ..