[ischmitz]

The other thing I didn't pick up on is the fact that you run a turbo setup. That is obviously not stock and I will affect your mixture.

When a turbo is added to a stock 3.2 there are many ways this can be done. In its simplest form you modify the chip, add a blow-off valve and the turbo. Then screw with injectors/fuel pressure and FPR and hope for the best. However, the barn-door AFM cannot differentiate between an intake charge under pressure (boost) and a N/A intake charge. The dilemma is that you have to protect the engine. So you need to increase the amount of fuel because you get more air into the cylinder if the charge is compressed. As a consequence without boost the mixture will be overly rich.

If yours is a bolt-on solution, I assume modified maps and a modified fuel pressure regulator are used to richen the mixture. This is so when boost kicks in it doesn't ping. The DME doesn’t see whether the engine is under boost or not. So it always delivers the increased fuel (due to FPR and map changes). This could cause your bucking.