I have to agree with bad cat' converter and/or faulty lean burn ignition.
If you dont have to pass emmisions tests, gutting the converter is just a matter of physical labor. Switching to basic electronic ignition isn't very expensive if you do it yourself.
The catalytic converter was my thought too. I just had a new catalytic converter, muffler, and exhaust installed earlier this week, and still really no change in the lean spot issue. I'm stumped!!
