I just purchased a 2003 Camry SE V6 Demo from a dealer in Northern Va. with 7,000 miles. At test drive this past weekend the car seemed fine; Drove it home Sat. afternoon...after sitting for two days started out this morning with a strange vibration in the drive train. (I Felt it in the wheel and floor.) It went away after traveling five miles. I drove for 100 miles...no problem. Stopped, came out five hours later for lunch and the same problem showed...not as bad. Went away again? The temp. this morning was 15 degrees; at around noon it was 35. Does anyone have a clue?

Just a hunch,but a cold engine idles a little higher with a richer fuel mixture,but regardless this should be covered under warrenty.Would suggest leaving it outside,overnight at the dealer.