Hi all .. i have tahoe 2007 .. my problem that when i hit the max speed from 40 mph .. i feel the car go upward slowly like there is a loss in the electric or engine interruptions .. i have taken the car to GM's Company about 6 times and they keep saying there is no problem in ur car .. after along time i have bought new 2 knock sensors and i have replacemented them .. after that i have tried to hit the max speed from 40 mph and i have noticed that most of the interruptions have vanished but still one interruption in annoying me .. anyone can help me plz. ?