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I just recently purchased a 2000 Jetta TDI. When I start it, it smokes for the first 15-30 seconds and idles rough. Then it runs smooth with no smoke. Is this normal or should it run smooth at start-up? Thanks for any advice.
 

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First check for any error codes. That will get you started. It could be a bad coolant temp sensor. It should run fine at start up.
 
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