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My 62,000 miles 1995 LS400 runs great on short trips, but it does have a tendency to stall after it's been driven for more than 30 miles or so at highway speeds. It re-starts OK, but will continue to stall thereafter if you lift off the accelerator at speed and thereby allow the revs to drop right down.

If anyone has any ideas, I'd be delighted to hear them. Thanks.

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Throttle position sensor faulty, or mis-aligned, or dirty throttle body?

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