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2 areas I would check unplug mass air sensor see if runs better its flat sensor near air filter , and u might need throttle position sensor for the hard shift
No, the modulator on a 4t60e only will adjust shift feel, not shift points. Does the trans not shift up or go it to neutral instead of 2nd? Does you speedo work? The pcm needs a speed input to shift the trans. You might have a bad VSS
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