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Failed Emissions - Any Takers?

My 86 4KS which runs great, and I think is without the many vacuum leaks it
had when I bought it, failed emissions today. If I had any doubts about the
car I would have used Techron and run it hard prior to taking this test.
Bottom line is it failed.
The guy got it to pass by removing the EM vacuum line, but I want to solve
the problem.

The failure was CO at 1.89 Pct with a limit of 1.20 Pct.

1 - any suggestions as to where to start checking?

2 - any suggestions re: testing the result of adjustments / changes?