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Old 05-02-2011, 11:26 AM
jpgerner jpgerner is offline
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Location: Las Vegas
 
Join Date: Feb 2008
Posts: 1
Mein Auto: 99 M3
Had the same problem, replaced 6 coils (with BavAuto HP) replaced O2 sensors, replaced fuel filter. Car ran fine wide open but stumbled in mid-range. I can't believe it myself, but I replaced the plugs and it is fixed. When I replaced the coils (I thought I was making an upgrade) I put in new plugs, but I chose the two prong Bosch instead of the four. The recent replacement was back to a set of four prongs, which is what were in the car to begin with. I still can't believe it, but it's fixed. (I've seen since on other posts that the NGK iridium IX plugs are highly recomended.)
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