This is exactly what contaminated injectors and carbon buildup feel like. Shuddering at idle and stumbling idle are usually carbon buildup rather than injectors.
Originally Posted by BimmerAWD
I am also having the same problem with my car (2008 335xi 6MT). It happens only at lower RPMs as you stated. It feels like the boost is breaking up under moderate to hard acceleration. I too have had the HPFP and injectors replaced under the recall. Also, no check engine light and otherwise the car runs great. I haven't had a chance to bring it to bring it to the dealer yet and won't be able to for another week or so because I'm leaving for vacation Tuesday. Please keep us posted, I'd love to know the resolution to this issue.
~ 13 M3 My daily beater
~ 13 x5M Hers
- Previous BMW's - Way too many to list here (15)