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Starting erratically and takes forever to turn over to establish a normal idle on 2000 Audi S4

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Any idea root cause of this phenomena on a 180,000 engine? Spark plugs replaced, Fuel system tuned up recently, replaced Fuel pressure regulator and still erratic.
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There should be some codes to trace down for this type of problem, that should really help you. Other wise you are pretty much guessing as the S4 is a VERY complex engine and turbo system.
which leads to my next question-Is an Audi dealer the best place to bring this type of problem? I prefer another trusted mechanic, but, when I mentioned the type of problem I was having he seemed puzzled...