I put new oil pump water pump timing chain valve cover gaskets. Since doing all of this when you start the vehical it runs perfect until it heats up a little then it revs up and down. I am not sure where to turn I have cleaned throttle body. Any input would be very much appriciated.

 

Did you disconnect the Idle Air Control Valve and not plug it back in?

 

I have went through several times making sure everything is plugged in but i will look again.