I am having the same issue with my 2003 H2, I have had the K&N filter system on it since 2005. Never a loss of power issue before. Its been going on for about 3 years now. Replaced TPS sensor, Pedal position sensor, Throttle acuator module, clean throttle body and MAS several times, new fuel filter, ran seafoam many times, new air filter. Still same problem. I was wondering if somehow the computer is now not reading the Mass air flow right and I need to purchase a tuner to set everything back up. Since this has been happening the transmission dont respond correctly. Any suggestions any one. Thx