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I have leguna 1.8 8v injection, headgasket went had head skimmed new gaskets fitted, on start up it revs between 3500-4000, but when you drive it, it settles back down on tickover but runs rough, also noticed brake servo not working on tickover but works at higher revs, checked for air leaks can't find any manifold gasket has been changed, timing doubled check ok, also when air intake covered it doesn't die.
 

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The fact that the engine continues to run with the inlet covered proves there must be a massive air leak into the manifold somewhere. The rule is - no air - no run.

Try lightly spraying WD40 or such around the inlet system and see if anything changes.:)
 
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