i have a 1986 Chevy caprice, it's a 3.4 fuel injected. automatic transmission.
it will start,stay in park, and go into neutral. if you try to put into any gear it shimmies and stalls.
the only thing we could come up with is that the tourque converter might be locking. or the transmission is going into forward and reverse and the same time when we put it into gear.
I had same problem ,I think you can check ur transmission fluid .
when did you last time filled it.
give it one shot,may be it work. :thumbs: