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The ecm is the issue.

The vehicle will move forward in idle. Only thing is it does not accelerate when you press the pedal.

Very well could be. I a new to these trucks. Any idea where that would be located?

Not to my knowledge. When we engage the pto you can hear it kick in when you disengage you can hear it shut off.

Working on a M977a2. Engine is running and sounds great. With transmission in neutral the engine throttles up and down fine. Once you place the transmission in gear you can no longer throttle. Once we put the transfer case in neutral then you can shift the transmission through all gears and the...