Q: My 2003 Chevy Tahoe drives when she wants good than there are times she won't go over 30 what could be the problem I have no light

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I'm trying to figure out while driving my 2003 Chevy Tahoe why does it goes almost like if I'm in nuetral like she can't go past 30 on off issue for 2 weeks than there's other time she does50/60 no problem someone stated a long shift from 2_3 also recommend a transmission flush is that appropriate for my situation

My car has 140000 miles.
My car's transmission is unknown to me.

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