Sometimes when im messing with my audio and have the car on ON and the engine not started, i mess with it for like 20 minutes. Then i start it, and it idles at a little below 4k rpm! I let it go for 30 seconds to see if it would drop, but it didn't. When i put the clutch in and put the car in gear, the RPM's drop to normal, and then put it back to neutral, and the RPM's are normal 550-650 again. So far in the past 2 weeks, its done that twice, both times were after messing with my audio for 20 or more minutes. Could this be some way for the car to recharge the battery maybe? I dont know about that because the car isnt actually moving.

 

make sure the battery terminals are on tight. My car did that when the battery wasnt connected.

 

just checked it, they're tight


any other ideas?

 

bump....

car just did it again

not throwing any codes

 

Clean the IACV, it might be sticking.
Might as well do the TB as well.....