Hello all.  Did the exhaust gaskets again.  Did my first helicoils.
Naturally, they are cylinder number 4.  Real fun.  Did have something
interesting happen.  I had perfect idle prior to the changing the exhaust
gaskets.  After changing the gaskets, seems that I had the seak back.  Turns
out that I had forgotten to reconnect the O2 sensor.  With the O2 sensor
connected, I again have perfect idle (no seaking).  Something that those of
you having a seak problem might want to check.

William