Looking for reason why a 2005 hummer H2 6.2 motor will not get out of its own way?

The motor runs, but barely and it will hardly move. Its like its pushing a wall. Seems like a fuel or airflow problem. Also seems like its running HOT but its not, we could smell something that was getting VERY HOT.. I am thinking maybe the CAT. Converter is clogged and wont let the motor breathe right. Could not see anything glowing red hot under the car. Any ideas??Looking for reason why a 2005 hummer H2 6.2 motor will not get out of its own way?If there were a fuel or ignition problem, you would likely see a check engine light. Perhaps you should check the wheel bearings or the parking brake adjustment. Lift each wheel and see if they rotate freely. Oh and by the way, unless you did a conversion, your 05 H2 has a 6.0 not a 6.2. The 6.2 wasn't introduced until 2007 model year. Good luck!Looking for reason why a 2005 hummer H2 6.2 motor will not get out of its own way?Converter clogged.