Having intermittent start up problems.Its behaving as though the battery is flat however by leaving it totally alone for half an hour and come back to it and it starts up and runs like a dream... For a few days.it s been to the mechanic 3 times now and he can t find anything wrong with it. Any ideas? It does seem to happen most often when the weather is cold/damp.I have a sense that is electrical or fuel related but have no idea what.I m really weary about taking it to Ford. I m on a budget and with out a clue this could be never ending.