idle change after driving for a while

my car runs good when started up and stuff idles at like 8 or 900 rpms. but when you drive it for a little while and say you come to a stop light it will be at like 1500 sometimes 2k anyone have any ideas why it would do that. i mean it runs good and all that but it justs idles a little high and i worry about it

idle surge, pretty normal for our cars

if you want a temp fix you can unplug the tps and just adjust idle with the BISS screw, if you want to spend some money and fix it, look at testing out the isc motor and replacing if need be

the isc on the car is brand spanking new. i had my ecu rebuilt and thats what caused it to blow so i bought a new one before i installed the isc.

but the idle doesnt surge at all i had idle surge when i first bought the car it holds steady at all times. it just after a while goes up to around 1500 and holds steady. but i will try it maybe the one they sent me is faulty

Clean your EGR valve. Mine is doing the same and the EGR is bad. Clean it out the right way, and see if anything changes. Should be the problem.

i dont have an egr valve i got a block off plate.

try to restart the ECU

unplug the battery for a few minutes, then try it again

I have a 6 pack on the throttle cable. When the car warms up the cable jacket expands, raising idle. This is exactly where I would start. Then look into other things if it's not the cause.

http://www.automotiveforums.com/vbulletin/showthread.php?t=336178&highlight=throttle+cable