Philip Foglar said:Not sure if this was already asked and answered. Have you ruled out coil packs as being a cause? The 320i had a coil that got a bit weak and it would cause the engine to stutter from low speeds. It never had a misfire or idle issue, but the moment you set off from a rolling yield in 2nd or 3rd gear, it would stutter and bog down.
What about fuel pump/filter? Maybe worth having the fuel pressure tested.
Saw that the coil packs were corroded on the outside at the suppressor didn't know if that could be a factor. Must still check fuel pressure