N14 red top pedal stops acelarating

Try swapping another ECM or have yours tested.

Usually when there's no throttle response, it's the pedal position sensor or/and the accelerator pedal.

 

And or it's a wiring problem between tps and ecm.

 

^ That too, especially since it's a intermittent problem.

I would be more inclined to say you have a bad wire or connector causing it to work intermittently.

 

Sry guys im new to this i dont know how to start a tread and this is the closest to my problem i have a kw t2000 99' with n14. My truck displays an engine throttle sensor short v circuit fault and check engine light is on but there is nothing wrong with the performance of the truck no sputtering no power loss or acc response everything is perfect. And then it stayes on until i get up to high gears and when i put it in 13th speed the check engine disappear but comes back as soon as i go back to low speeds or when i get it out to neutral... if somebody has some experience with this i would appreciate it. Thank you in advance.