So I was driving into work yesterday. About an hour of rough bumpy roads into camp. When i went to park the truck, I put it into park and notice that my idle had gone up about 300-400 rpm. The only thing I have done, mods wise, is turn my power screw 2 turns and re-adjust my idle accordingly. I checked all my throttle linkage and that wasn't the problem.
Anyone experianced anything like this? Should I just re-adjust my idle again, seems weird that it would do this. My truck has been on rougher roads with no problems before....

 

Is the locknut still tight on the idle adj rod? When I reset mine I thought it was tight....