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I'd bet on a manifold gasket; I'm changing mine now at 250K miles. If your car is not noticably missing and running fairly well, suspect the gasket. Your probably due for them anyway You could do it yourself if your up to the challenge; only $10.00 for set of four gaskets and you may want to change the exhaust gasket right at the manifold while your at it. A few little tricks and nuts are hard to get to but doable; what the heck I'm a computer programmer and alway work on my own car.
If you need info, check 740/940 FAQ
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