vacume modulator problems again?

[86C10]

installed new vacume modulator. my truck is shifting gears now. however the tranny is shifting prematurely. it does'nt even feel like a full shift either it's not a jerking feeling it's more like a tiny push--don't know how else to explain it.i was told to take hose off of modulator and try turning the end of the modulator one way or the other. i've tried both ways and nothing seems to make the shifting right.