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Q: my car surges at 70mph on 1992 Lexus SC300

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it starts normaly, drives smooth, everything else operates correctly.
(1) Answer
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It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. It could be a transmission problem, could be oxygen sensor related, a vacuum leak (but I don't think so at cruise intake manifold vacuum is low). Too hard to guess without being able to drive the car