I changed all 9 solenoids about 9 months ago with the kit from Cobra Trans. It solved my no reverse and hard 1-2 shift. It's been running great since. Two days ago I changed the oil, not sure if it's related to my latest issue or not, I drove the Jetta for a few miles then it started shifting hard in all gears. The hardest shift is from 2-3...enough to jolt the whole car. The next day it started missing really bad when I would put it in gear. I cleaned the MAF and checked for vacuum leaks. I found a cracked vacuum hose off of the master cylinder and fixed that. I don't think it was leaking, but needed fixed.
The latest codes I get when I scan are 18032, 16684, 16687, 16688 & 16686. Looks like misfires and maybe a TCM code? I am not sure if the miss is associated with the shifting because it didn't show up immediately with the shifting issue. Any help or leads is appreciated.