They all do it to some degree. Oil on the cold plugs fouls them, then they burn off after it warms up its no longer a problem. Every thing tightens up and warms up and WAALAA its smooth. Mine has done it for the past 99k miles. My LS cars rattled and shook so bad cold you,d they were going to pop. After 800k miles or so you get used to it. I noticed as mine has got more miles on it it uses less oil and shakes less cold.
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