i had similar thing with my 3.2 petrol musso, i removed the air flow sensor and cleaned it with brake cleaner,same as carb cleaner, cured it for me , its now in my service routine.132000 miles and can still 4 wheel power drift but 14 to the gallon !may p/ex for an economical 5.2lt v8 yank :-)
motor buddies
June 2011