[s-cars] Denso Iridium Plugs - No Good for Our Cars

[Bruce Mendel]

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I have been using them for about 500 miles, and I get a stumble when pullin=
g hard from low RPM, where the boost is basically ahead of the RPMS. For ex=
ample, flooring it in 4th from 1500 RPM, and having boost build up prior to=
 high RPMs.

There is an intermittent light stumble, about every three seconds, until th=
e RPMs are at 4500 or so. I experienced this in cold weather (30 F), with w=
ater injection turned off.

I switched back to Bosch plugs, and the problem went away. Stay tuned as I =
attempt to get a refund on used spark plugs!

I think Pizzoman is having the exact same problem.

Bruce