Only thing similar that I've experienced in my 3.2L is when I'm in Sport mode and I hit a hill at a lower speed. The tranny shifts into a higher gear but the rpms are not high enough so it feels like its choking, I have to either punch the gas or switch out of sports mode, then it works fine. If I hit the hill at just the right speed it sometimes works even in sports mode but lots of times it just gets bogged down.