I have a 2002 Faltbed 3500 2wd 5spd and the guy i live with literaly has the exact same truck except his is a 6speed...but to the problem his truck one day when driving down the road started speeding up he tryd to stop it but the engine was at redline so he killed it well went to restart it, it wouldnt start. so i pulled it home well we got it started and then it idled fine but had no power what so ever couldnt even get into 5th. then he had to take it to work cus thats his only truck and a few days later it will idle but wont rev(you his the throttle and its hesitates then the rpms just flutter) well truth fully i dont remeber all the rest but he has replace the pcm and ecm and had two or three machanics look it over and they have no clue.....any ideas? and we put the computer thats on the drivers side of the truck bolted to the block on my truck that was on his and my truck did the exact same thing and threw the same codes..then put mine back on my truck and its perfect. but it was a new computer....so if theres something that threw that new computer off when we put it on his truck first what could it be?.....we are lost!!!!

 

what were the codes just a guess but it could be the VP 44 or the apps but with out the codes also is it chipped?

 

yes it has a quadzilla and on the codes ill have to get back to you monday or so when i get back in town and theres bout 15 codes

 

Since the ECM seems to be common denominator (same symptoms in two trucks with the same part), I'd be looking at that. It could have the wrong calibrations in it, like for an auto, or different year. I'd take it back and see if they will reflash it for you.

 

they have sent him 3 different computers......the exact same trucks! 2002 late... 3500 cab and chassis 2wd white flatbed single cab exact! except 6 vs 5 speed

 

Which quad box do you have? See if you have a 1691 code.