I have a JDM B16 Motor in my 92 Civic 4 door. It idles really high(2500-3000 rpm) most of the time until my car has been running at normal operating temperature for 5 mins or so. Up until a few days ago, it would just drop down to normal levels after that. Now it goes up and down repeatedly every few seconds.

If anyone knows what's wrong with it and what needs to be fixed it would be greatly appreciated. I'm thinking it might be the TPS sensor but I don't know for sure.

Thanks!