I took my 528e to get smoged and it failed because the ignition timming was to high. fixed that, took it back and the low rpm pased but failed at high rpm what does this mean? Also i'm having problems when engine is cold, it hesitates when i give it gas almost like somethings plugged up somewhere

what are your readings? Did you fail Nox, Co2, or HC?

Sounds to me you need to clean some things up in there.