My daughter's 01 Cabrio cut off in an intersection, had to have the car towed home. Engine turns over, checked timing by comparing TDC marks on crank and cam they match, verified spark to plugs, and fuel to cylinders. Does not show any error codes on the OBD II scan tool. No major repairs have been done except to replace the MAF sensor about a year ago. car has ran fine ever since. It has got to be something obvious I'm missing.