I have a 2005 Grand Marquis that has developed a problem of not starting right away on occasion. Letting the car sit with the ignition switch on for a few minutes seems to help but not always. It also seems to do it more when it is cooler (below 55 degrees) but not always the case. So far it has not failed to start but it may take several tries. So far I have changed the fuel filter and added a bottle of Lucas injector cleaner. The car started a full week without incident after adding the cleaner after running a little more than a half tank of gas. I did not add another bottle when I filled it. Any help but be appreciated.