there is a 100000000000page thread about this in the Warranty Issues & SOA Problems section... but the fix is VERY simple
you need a long phillips head screw driver and about 10 min of free time.
look on the pass side fuel rail under the intake mani.
you will see a small 3inch long rubber connector on the fuel rails... the hose clamps that are on them get loose as time goes on and leak when it gets cold and the rubber contracts. tighten the clamps and you are golden.
its that easy.