Hummer H2 I have a Hummer H2 SUT 2005 Model am suffering with unknown problem for the last 3 years and am unable to fix this problem, The car completely losses its power after 120 KM Speed. if am driving on the high way at 120 KM fourth gear and I need to increase the speed to 140 KM I have to kick down and push ******* the engine till the speed reach 140KM in the 3 Gear once I reach this speed the Gear **** to 4 gear the care will not be able to maintain this speed and it will drop back to 120K moreover its there were a hill or air resistance the car cant even maintain the 120KM speed on the fourth gear I always need to kick down on the 3rd Gear to bring the speed up and once fourth gear is engaged again the car cant maintain the speed the gear for long. I changed everything on this Car 1. Airflow Sensor 2. MSD ignition 3. MSD Ignition Coils 4. Fast Intake Manifold 5. Throttle Body 6. High output alternator 7. K&N Air Filter 8. Gipson Headers yet with all the above high quality Modifications which should increase the power of the car nothing changed still problem is the same though I have tuned the computer on the Dyno many times am unable to sort out this problem. last the car have a very good pickup and speed acceleration from 0 to 120 KM but after 120KM the car is completely dead

Cars & Trucks - Hummer - H2 - 2005 Hummer H2 SUT