so i have a del sol si with a d16z6. all stock but a exhaust and intake and the idle keeps going up and down like some other hondas. i cleaned out the iacv a couple times and it keeps getting better but now it only does it when it gets warm and some times it will hold and stop but starting doing it agian once i hit the gas. if i disconnect the tps it stops doing it and just holds at a certain rpm? so you think its a bad tps sensor or should i pull the iacv again and try to really really really clean it out. all the help is appriciated thank you guys.

 

maybe it's better that you change the iacv....

 

If it's an ODB1 motor then it's your Fast Idle Thermo Valve. Remove it, clean it thoroughly and then re-install, it should bring the idle back to normal. You may also need some adjustment of your idle screw on the throttle body. The cleaning of the FITV has been covered numerously here. Do a quick search, you will see. Good luck