My 02 frontier is having problem shifting in gear when you push down on the gas. You can tell it want to go into hi gear but i don't. I can't even pass anyone. I has 95000 miles on it. The last time i had this problem was at 90000 miles. The tech told me nothing was wrong then. I need to know what will cause it to do this. Some days it do it and some days it don't.

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