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you should do the tune up before mixture adjust,
timing and such.
I really don't think that is a good plug for Porsche.
use copper plugs.
bosch supers or NGK.
those you cant gap.
if it pops at steady RPM you are lean/ have air leak.
if under acceleration it is the vacuum portion of the WUR. the CP drops under acceleration.
been quite a while but when I tested mine with the vacuum removed it popped and sputtered under accel, but drove fine at steady speed
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86 930 94kmiles [_ _] RUNNING: [__] NOT RUNNING: ____77 911S widebody: SOLD
88 BMW 325is 200K+ SOLD
03 BMW 330CI 220K:: [__] RUNNING: [__] NOT RUNNING:
01 suburban 330K:: [__] RUNNING: [__] NOT RUNNING:
RACE CAR:: sold
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