Recently, my 2001 3.0 V6 4x4 became difficult to start, especially when cold. It cranks fine, but doesn't start for several seconds and then runs rough at first. After I drive it, it starts a little quicker but not always. No engine light comes on and it seems to be getting worse. I thought it might be bad fuel, but I've been thru several tanks of gas since it started acting up. Any thoughts would be appreciated! Thanks!