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I am having the same issue. At first I thought that it was just because of the cold weather, but it seemed to be worse than it should be. And smoking when taking off from a stop when the engine is warm really caught my attention. I started my pickup yesterday for the first time in 2 weeks, and there was a huge cloud of smoke for about 10 minutes, then it just went away. At first I thought maybe the engine turned off, but it was still running.
I have an Edge insight hooked up and I know my FICM is getting weak because it drops down to 46 under load, and on cold starts it will go down to 36. When the pickup is plugged in, the FICM doesn't seem to drop down that low. I still plan on getting that replaced ASAP. On cold starts, the edge also showed me that there was a cylinder 2 contribution code, didn't set off the check engine or anything, but a soft code. That code always goes away after the engine is warm, and is very rarely present when FICM is showing full voltage.
I asked this very same question on another post yesterday after seeing the huge cloud of smoke, and the best answer I have got is an Injector problem, and that using motorcraft oil, changing every 3-4K, helped prolong injector life. I have been going 5000, but was up to 7000 on my last change. I run Rev-X which is supposed to extend the time between changes, but I still stick to 5000 when I can. I always use motorcraft filters. The fuel filter only has 10k on it, but looking at changing that next oil change. I have heard that water in the system could also do it, so going to try to drain the water separator today.