ok since i painted my valve cover yesterday and put it back on my car has been idling very wierd. when i fist turn on my car it goes up to 1200 then back down to 1000ish or 1100ish. Before when id start my car it would start up at about 900rpms and then go back down to 600 - 700 ish rpms, what could this be? did i not torque my valve cover right? did i accedentally move something under the valve cover? anybody got a guess?