Help me out here. I have a D600 with 48RE. We have had our first cool weather. After the engine is warmed minimally, gage about 1/3 up from cold, as I pull onto the highway, it seems the engine has a "miss" as I go to about 1/2 throttle. Feels like a sparkplug miss. Is this what I have heard is the engine firing on alternate cylinders to warm it up more quickly? It idles smoothly and the "miss" goes away after the gage reads straight up. Please inform me. Thanks. 
