I got 2000 chevy 6.0 3/4 ton. The other day i was driving it and lost all power it would run about 2500 at 65 mph which its usually around 1900 (3.73s) The engine light did not come one. And i put it to the mats and nothing wont shift down. But sometimes it will and it will be screamin at like 3700 and sound like its missing. So i pulled over and pulled the 02 sensor fuses and then the engine light came on but it ran fine going down the highway but when its just idling it shakes and idles at like 400 like it did before. but soon as you throttle it up its fine. anybody know what would cause this?

Thanks
Pax

 

sounds like its skipping at idle.

 

when's the last time you cleaned the throttle body and MAF sensor?