Posted: April 6, 2013 at 2:53 a.m.

DEAR TOM AND RAY: I live in the San Francisco Bay area and love my 2003 Nissan Maxima. It works fine, except for a problem we began to experience last summer. On a trip to Las Vegas in hot weather, the car began to shift into third gear very roughly when we started climbing into the mountains. The temperature was in the high 90s, and the engine temperature went up, though not to the danger level. When the car shifted back into fourth, again, the shifting was very rough.

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