Originally posted by ScottR:
(Trim)
Because it�s a double-overhead cam, my mechanic didn�t have the tools to get the timing perfect, so I took it to a Ford dealership and they corrected the timing with their special tools.


Could you elaborate - what was your mechanic trying to time - the valves?

Originally posted by ScottR:
(Trim)
Even so, the check engine light kept coming back on with the same code (lean fuel fixture).


Specifically what code(s) are stored, and did you look at the freeze frame data?

Originally posted by ScottR:
When it�s very cold (like today), the car is quite difficult to start and seems like it is not getting any fuel


That sounds like a vacuum leak to me. It could be any place between the MAF and the combustion chamber - check the accordian tube for a small crack, the TB gaskets, upper and lower intake manifold gaskets, injector o-rings, and all vacuum hoses, including the PCV hose.

Originally posted by ScottR:
Is it possible for the dealership to accurately tell me different causes every time I take my car in for service?


Based on your explanation, it doesn't seem so, does it?