i am a loyal ford man i have an 85 mustang gt (my first car that i still own and drive) and drove an explorer through college and highschool as well. im looking at buying an 04 f150 fx4 on craigslist upon googling problems im hearing a lot about sparkplug problems and something about trucks made at certain plants during certain times. anybody know which factory not to buy a truck that was produced there and where can i look on the truck to see that information when i go to look at it? please help i dont want to buy anything but ford but i also can afford new engines and crap like that!!!