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« on: July 17, 2015, 02:53:05 AM »
Hello all.
Thanks again for all of the help and advice. I have to tell you it was not easy or completely clear what happened or the series of events at least.
While we have solved the problem we hope to have figured out the cause.
The issue, and it makes me a bit embarrassed not to have looked, was that the transmission and engine bolts were loose, two missing in fact. Now i am 100% sure that they were tightened. Both of us know we tightened them. We did however miss putting in the one bolt (small opening between firewall and has to go in before install).
Our theory is that the plugs were the wrong ones and were running cold and causing vibration.
This, coupled with the fact that I did not loosen the transmission when I tightened the flexplate led to the bolts backing off and increasing the vibration.
The second issue is that the Quadrajet carb was not tuned very well and the air mixture screws were worn badly. This led to poor fuel consumption. Seems better with new screws and I still have some adjusting to do.
My failure to loosen transmission mount bolts led to a gap between the engine and trans and when I tightened the flex plate it pulled the torque converter part way out of trans up against the flex plate. Once i loosened the transmission mount the trans pulled up tight and everything fit well.
So it seems we have solved the dilemma. AT least for now.
All of you and your help are greatly appreciated.