goofinoff

I posted a question and got some response earlier, just need a little more help with this one. Had code P0402 come up, and found out here and on another website that I should clean carbon buildup behind the throttle body and pull the EGR and clean it. I also read I should reset the PCM, but not sure what this means. Anybody know what this means, and how I should go about it? Any other info or tips would be appreciated as well. Thanx

centsless

remove negative battery cable and step on the brakes for about 30 seconds, reinstall negative. resetting the ECM. thats what that means.
the rest is pretty self evident