I'm sure I've seen this on here before, but I cannot find it. Just got back from a trip through the mountains. Wondering if this had happen to anyone. Going up a long grade, engine RPM has to above 5000, the engine feels like it is studdering. Has done this since new [ now has 66,000km]. Only now has it kind of bothered me Maybe because the lease is up and we are wondering if we want to keep it. 2.4L auto.