318 running rough and losing vacuum when in gear.

I think I found the issue.
Remember I said I could not rotate rear wheels by hand on jack stands.
disconnected driveshaft. tires turn free.
started engine not nearly as bad idle but still boggy when I put in drive. then when I went to shift into park it would not go just made that clattering noise like when u go in reverse by mistake. doesn't catch. turned engine off went in park. repeated process to be sure. so I am 99% sure torque converter???