The problem is the Mass Air Flow sensor that usually gets covered in all kinds of dirt and stuff and malfunctions. Now, the S85 engine has 2 two of them, one for each bank so replacing them might ...

The mass air flow sensor (MAF) tells the PC how much air is flowing into the engine; we read that data in grams. So a little air means no foot on the throttle and lots of air means foot to the floor.