i am having problems with my truck but mine at 35 - 40 mph the rpms will go up and down and when i accelerate the rpms go up about 200 rpms and then jump down almost 5-6 hundred like it found another gear ive replaced the apps once throught the dealer and that one lasted a year so i found a used one that was still in good working order (tried on friends truck first) and still having same problem. could it be transmission or apps or something else? when i replaced the apps the first time the problem went away. i have also replaced the factory lift pump with a fass 95/150 and replaced my vp44

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If your friend has a similar truck try swapping parts onto his running truck until it acts like yours? Put your parts on his not the other way. Wiring look good? Maybe ECU going bad. IDK

 

wiring is good i will try thx