Wife has been having problems past couple of weeks when she leaves for work and then again when she leaves work to come home with the truck cranking up. I only had a problem once and it just took a few seconds longer to crank up. This morning went to crank the truck up before she left and it won't crank. It turns over and it fired a few times but it won't crank up. I just replaced the fuel filter a month ago and it had been running for since then any idea what it could be? I am going to go check my wires here in a minute but just wanted to know what else it may be.