Slight stumble = diverter valve springs?
 

Hi everyone,

I have a 2009 E61 6MT with 78k on the clock. About 2 years ago (10k Miles) the car received new injectors, plugs, coils, and a walnut blast. The car has a slight stumble on acceleration.

I ran the BT tool which picked up a #2 misfire. I swapped the #2 coil to #1 and the code went away but problem persists. When I installed the Cobb stage 1 tune I did not bump up to yellow springs in the Forge DVs. Could I be feeling the DVs bleed boost? The other area I am curious about are the VANOS solenoids. Could these cause similar stumble?

Any feedback is appreciated. Happy Holidays!