Hey guys i have quick question hoping somebody can help.... I have noticed on my 2005 FX4,that when go some where and turn the engine off but leave the key in, so that i can have the radio on, that the check engine light comes on after i turn the key to start the truck. Then when i have the truck parked for about an hour or so, with out the radio just sitting there the check engine light turns back off. I don't have a clue why its doing this, or if im the only one??? Is this something that happense to these trucks? Can someone give me some advice??

Thanks.....