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Surging at 11 psi fixed (UrQ)

Again, thanks for all the advice.

As I wrote this weekend, I was going to again tackle the problem of
surging/missing at 11psi.  My major missing problems earlier had been
traced to a bad plug (cracked insulator).

My first step this weekend was to replace the other 4 plugs.  Unlike the
first one, these all still looked new. (Bosch tri-electrodes, 8k on
them).  I replaced them anyway and test drove the car. (I try to test
after every change so I'll know what helped and what didn't... an
important hot rodder's technique.)

To my surprise, the car drove like a different vehicle (one without
missing and surging... and willing to pull strongly to the

I'm very surprised that these plugs which are known for lasting MUCH
longer went bad so quickly... with no physical clues... they look
great... not worn, cracked, etc. (Recent coil, rotor, cap, and wires)

Any suggestions?  I sucessfully use Bosch (NOT platinums) in
everything... Corvairs to Trabant to SAAB... should I use NGK here?

Bill Elliott
Lake Mills, WI