If its lurching, then we are back to a clutch system issue. You're going to have to pull the transmission down.
It sucks. I just did a motor replacement and, when it was all back together, the clutch was slipping. I had to pull it all down and buy all new clutch parts. My only conclusion is that, when the motor exploded, the clutch got contaminated.
Point being . . . it sucks, but you're not alone.