Thanks, BOP. Very informative chat. I think after looking at everything that most likely the intake on this motor was loose on the driver's side, thus allowing air to leak into the fuel flow and create a lean condition on just one side of the motor. Any other cause of a lean condition, given the motor had 1991 fuel management, would have not been so selective as to detonate only one side of the motor. I appreciate all input. This is how us "unwashed hobbyists" can learn about our passion.