Shift Linkage, maybe? 2200 tranny... 3 speed or 4 speed?
4 speed and I can shift it manually but it is really ruff
Change the filter. My dad's old buick had the same problem. All we did was change the filter and do a half assed flush (pour fluid in while the pan was off) and it fixed it.
Ran ODB2 code is P1680=PCM and shift silinode a&b just wondering if the PCM is causing it to not shift or is it the shift silinoids