My 1990 2.5 L 4 c=cyl Automatic Tranny Voyager died while driving. I was able to restart, but it ran extremely rough. The moment I put it in drive, it would die. So, With gas peddal partly depressed to raise the RPMs, I was finally able to put it in drive, and somehow make it back home. I had similar symptoms few years ago, and it was MAP sensor.
Replacing it then, fixed the problem.
However, no such luck this time. New MAP sensor makes no difference. I also replaced the MAP sensor hose.

What else should I check ? I'm apparently firing on all 4 cyl, but engine runs very rough. Could oxygen sensor cause this ?

I get no error codes on my dash. Just the usual 55.

if equipped with an egr valve try disconnecting it