Well, try some injector cleaner first, sounds like when u get on the gas the injectors might be dirty or misefire causing that weird sound/feeling. If that doesnt fix things up, id look at a tranny issue. Check the tranny fluid first, if thats not it ur tranny might have some issues. Or dare i say it, this could be a combination of a couple issues, one for the whole shifting problem and goin slow up the hill, and another for the misfiring etc. If u try some stuff, and post results, ill see if i can think of anything else.
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