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How about the fact that it was 27 degrees out? Probably just not warmed up fully, and running a little cold/lean. How long were you driving? I doubt it was for too long with no windshield and no plates. Check out the ideas others have suggested, but reserve judgement until you can get a true run, on a warmer day. These things are not especially cold blooded.

Congratulation on the first drive, bet you were plenty warm with excitement.

Don