Does that engine have VCT? I'm wondering if the oil is draining back out of it after shut down? Then when you start you hear it fill back up and it runs rough until this happens. With the weather being colder this is taking longer.
I'd change your oil filter to the Ford one I believe it has a valve to prevent flowback.
Just a cheap easy thing to try
Whats a VCT? yeah but we've had the car new since 2004. why would this be happening now? i will give it a shot though.. i'll hit the stealership up next time i change the oil, which will be soon to pick up the ford filter.
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