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Looking at your question again, Robert is right and you need to look at the whole intake path to answer the question properly, what sort of air cleaner do you have? fuel injected? Does it have a warm air intake for warm up...
Often just cleaning the throttle body makes a positive difference in the intake tract. Oil from pcv collects in there, soot can build up from egr... look on a forum related to your model or something similar and its likley that you will find a discission of these issues.
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