I have a 2000 honda accord ex. V6
Car ran great before car broke down on me.
The spark plug blew out.
The porcelain and strap on the porcelain, gone.
I assume all the debris blew out through the valves and used a helicoil kit and installed an insert.

Did a compression test and all cylinders are 120 plus.
Installed new plugs, started car and was running great warming up for a few minutes then the idle starts going up and down.

Seems like when it is supposed to lower idle as it warms up and when it gets to that threshold ,
the rpms go up and down.

I did find a porcelain piece stuck in the egr valve so is it possible it took out the IACV also?