Long Journeys

Hi All, I know the saying that short journeys say about 1-10 miles don't do a car much good and would that apply to the throttle body as well? So how about long journeys like London to Southampton as when I went too beaulieu motor museum & that was very long drive about 100 miles round trip with no problems with the T/B. Except for parking & waiting at traffic lights these are the times that my the T/B fails intermittently. and apart from this information would be down to age as my had no service history and is 20 years old?

Yours Peter0003