This is something I noticed a few days ago when I I got stuck in a mud hole. It was just up to the bottom of the skid plates but just that nasty peanut butter mud. When I was trying to rock it back and forth, I noticed it stumbling on itself in reverse. I would barely give it half throttle and it starts choking, like its getting too much or not enough fuel, it does this in 2 or 4wd. When going forward its ok, it has a bit of delayed throttle response. I plan on pulling it into the garage tomorrow, what are some simple things I can check?? The air filter is clean, fuel filter and spark plug (factory NGK plug) have been replaced a few months back, and the oil was changed back in April of this year. Your help will be greatly appreciated, thanks!!