I have a 2002 Suburban with the 5.3 L Flex Fuel engine with 128,000 miles. It is not driven every day. Sometimes it can go a week without being driven. In the past it always fired up immediately. About two months ago, the fuel filter clogged on me and it wouldn't start at all. I replaced the filter and all appeared well. However, now if I leave it a week without driving, it doesn't want to start. I have to cycle the ignition switch about three times before it will start. After the first start, I am good to go the rest of the day. I have checked the fuel pressure and it is on the low extreme of acceptable pressure. Any thoughts?