its normal to start the car in the morning and the rpm is at 1500-1800rpm right ...but when the car gets warm, it goes up to 2000rpm so i got to let the car sit there so it go down to 900 rpm, i got a 98 gsr,and i want to know why it does that?

 

you should really do a search as this topic is/has been addressed numerous times in each vehicle thread in the last couple months.

 

i did but cant find nothing?