i own a 1998 528i bmw, recently i bought hi performance coils from bavarian autosport, i installed"em, car ran rough, found 2,5n6 banks misfireing, bavauto sent me 3 new coils, install"em now #1 bank is misfireing, my mechanic said after market coils not good go with oem, any one else have this problem with bavauto ?
Did you also upgrade your boots and plugs? If you have not done so, I would recommend it. I installed mine and have had no problem at all.
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