Man,...I hate to say this,..but it sounds like you are doing it. I could be wrong,...but try paying attention to foot placement. Do you plant your right heal against the tub of the Jeep (the transmission hump)? If not, you may be bobbing your foot up and down giving it little spurts of gas, which gets worse when you are hitting bumps. Being it's only the 2.5l, thats may be why you're only noticing it in 1st and 2nd or 4lo.
Im not trying to insult you, it's just that I've seen this when I was teaching a friend to drive my old 6 spd Jeep. She would do it, and didn't realize that she was, until I had her plant her heal better. Hope this helps.
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