driving home from the store this morning i turned a corner and my truck started running rough and blowing white smoke out the exhaust. i was able to make it home about 2 miles.it was idling rough and when i stepped on the accelerator it blew a huge cloud out the exhaust.i went to the tail pipe and the smoke cloud and it was fuel. i shut the truck off and started it about 5 minutes later and it "s perfect. no miss no smoke. it's got 210,000 and has always been maintained very well. it's been a great truck for the 7 years i've had it.i bought it in Texas with 165,000 miles on it.I live in Ohio.i'm baffeled. any ideas?