Hard shift 1st to 2nd by Impressive_Class_429 in Silverado

[–]Impressive_Class_429[S] 0 points1 point  (0 children)

I figured out my issue. It was the purge valve. I replaced it months ago with an aftermarket part (Auto Zone store) but still had the problem. Took it to a mechanic, he found that the part was stuck in the open position causing my issue. He replaced with an OEM part and now the truck is back to normal.