I've been getting these three codes when I plug in the diagnostic checker; VAF, MAF, and Fuel Air Metering. My VW is hesitating and sputters, it also likes to completely shut off every once in a while as I'm coming to a stop or stopped at a light. A year ago I put in a new MAF sensor meter and still the check engine light came on. Next I changed the oxygen sensors and just changed the MAF sensor meter again. Has anyone had this issue and know how to fix it?