2003 Passat Wagon - hesitation at 40mph
 

My '03 Passat Wagon exhibits a hesitation when under slight acceleration on a slight grade. No hesitation while under strong acceleration. VW Service diagnostics show no faults. Was wondering about possible EGR system issues and/or having the throttle body adaptation reset. I had the battery replaced probably 18months ago - didn't notice this hesitation until about 4 months ago. Any ideas?