[bigfish95971]

Probably dirty, even slightly calcified, terminals/cable ends or high resistance in long cables.

 

[bigfish95971]

Pull codes with a scan tool, not key, and does wait to start light come on everytime immediately when you turn the key to ON? Any other engine drivability issues other than dead pedal, ofthe when fully warmed up after an hour or so, or dies it do it cold?

 

[bigfish95971]

Did you do an APPS reset after new apps. Those codes can be dueto the cables and alt issues. What is charging voltage now? That is along ways away for batteries, Cool truck, when are you going to paint it, what color?

 

[bigfish95971]

This does not sound like normal "Dead Pedal" issues for a Dodge Cummins. 13.5 is low, Should be 14v. Is PCM OK? Probe pin #3 on apps and see what the voltage is and is it smooth from idle to WOT. It should be .64 at idle with a Timbo and smoothly graduate to about 3.8v. Check wire between APPS and ECM.

PS I consider Timbo Junk especially on 98.5 and 99. You truck is supposed to have an idle voltage of under .529v. Most APPS are adjsutable to that range of .48 to.53. The Timbo is not adjustable and can only put out .64v for idle. This confuses the ECM into thinking you are accelerating when you are not and causing surging. The voltage your apps is supposed to be is printed on the old APPS or ECM. Reset does not work if over that range to .529v.
But I do not think that is your issue presently because it does not prevent acceleration above that.

I think if ECM i good WTS light working as it should, the VP is all done. Check out Bluechip diagnostics.