I have now had this happen twice this season.Start the engine after trailer into loading area,let it warm up(off the cold mark on gauge).Engine idles good,accelerates good then rpm drop to 2000rpm.It will do this until the engine is up to normal temp and for about 10min.Has now happened twice this season when starting below -15.Runs great after with no issues.I tried both DESS cords,no dofference.Anyone with an Idea?