So I currently own a 95 Civic EX with around 179K miles, and I am having idle issues. My buddy and I just did a head gasket and timing belt on the car, and the car idled fine upon the first startup. The next day I started the car and let it idle for about 30 minutes with no issues (900-1000 rpm idle), and then I began to rev the motor and it stayed idling at around 3K rpm without ever going back down. Upon doing a cold start this morning, the car idled at around 4K rpm which is absolutely ridiculous. Not sure if anyone has ever had this issue, but some advice would be greatly appreciated as to what could be the cause!

 

Someone's gotta know something!

 

Check throttle body and cable. Throttle plate may be sticking, or throttle cable sticking, causing plate to open partially. Must have a little slack on cable...