Unidentified engine bucking.... 4kq

[KMracer007 at aol.com]

Ok, I leave work for lunch today, go for the usual "I can get my car in there" left turn into traffic and I am greeted with a nasty thump and consequent bucking of the motor at anything above 1/8 throttle. I can get to 35 or 40 but havent gone any faster. I figured it was a motor mount on the right side, lucky me, there is one sitting on the bench still in OEM packaging. I put it in and go for a test drive. The bucking is still there. I am goin after the right side tranny mount next as soon as it cools off in there a little. If anyone has experienced this before or can point me in the right direction that would be great. Also a point of note, I checked the center driveshaft donut thing and it seemed fine along with all the CV's on the car. Thanks in advance!
~Kenny
85 4kq w/issues
90 V8q