What would cause my truck to fall on its face at 2000 rpm? It won't shift until I back off the throttle and fall below 2000 rpm's. I'm not able to drive past 70 mph or so, since that is around the 2000 rpm mark. I called the dealer and they say it's probably a bad fuel filter and the fuel that I have been using for the last 10 months. I know of a guy with a lbz with similar problems and his dealer can find nothing wrong. My dealer also said it's probably because of the cold weather but today it is 30 degrees and yesterday it was 12 degrees with no problem. I have no mods on it to mention of.