engine won't idle but has good power when under way

2001 HOLDEN VECTRA
167,000 MILES
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GRUMBLEBUM6142
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My wife has just bought a 2001 Holden Vectra 2.2 automatic GL. it goes well but is idling very roughly and making a tapping sound. The Vectra has plenty of zip and everything works OK. However it is idling very roughly, hesitating and missing but it has never cut out altogether.It also makes a distinct tapping noise,which obviously would be tappet noise I assume.

We have had the car for three weeks now, and it hasn't let us down. Would a tune up such as new spark plugs and injector clean fix the idling problem do you think? As far as the tapping, if the tappets need repair/replace or whatever they do would that be a major and expensive repair. Regards.
Oct 12, 2011 at 5:49 AM
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MHPAUTOS
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Do a tune and get the iac cleaned, check for vacuum leaks and run a diagnostic scan for any unresolved fault codes, to replace the lash adjusters is a bit of a job, as all should be replaced at one time, how may Km's has it done,you say 167 Miles or is that Km's? as it may be due for a timing belt kit as well.
Oct 12, 2011 at 6:01 AM