The platinum plugs don't wear or foul nearly as much as standard plugs,
hence the 100k suggested tune-up interval. I usually change em' between
60k-75k on the newer trucks w/ platinum plugs. Pull all the plugs, check
the gap, clean em' up with a wire brush and run some Chevron Techron thru
the next tank of gas. With MPFI, the injectors are so damn small they get
funked up pretty easily, which can result in a sputtery idle, etc.
When I asked about plugs in here a few weeks ago, everyone said to go with
"AC Delco Rapid Fire" and so I did. I swear that my engine is running more
smooth than it ever has and it suddenly has tons of power. Of course, the
old plugs were melted down to the ceramic, but still! :)
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