Well we cleaned the IAT with no difference, also added some octane booster but that didnt help either. Ive read up on the O2 sensor and the EGR and neither seem to fit the symptoms. The confusing thing is the fact that the hesitation comes and goes, seemingly only when the car is stone cold but even to get it to stop when it warms up you must turn the car off and restart it. ANY MORE IDEAS GUYS?