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Discussion Starter #1 (Edited)
Hi
Wonder if any one can help my bmw 528i e39 1998 was running fine but now only runs smooth at first start up but when it warms up it holds back and idles rough.I have changed all the spark plugs but no joy.
 

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Have you tried popping the hood and listening if you hear air leakage at the intake?
 

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The first step in diagnosing a problem is to scan the engine computer (DME) for codes. I bet you’ll get codes P0171 and P0174. Both are indications of vacuum leakS!
 
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