Answer to "Engine stumbles on acceleration"I have a 2001 n14 no sputtering between 9th and 10th gear. Had a bunch of work done to it fuel lines wiring harness have the fuel pump replaced none of that seemed to work. Finally I had the injectors checked they said that a couple of them were underperforming so I had those replaced but at the same time I had the ECM sent out to SIAelec.com and they found that to ICs on the injector control module had melted. I believe that was the problem all along. I remember that I noticed the problem around a time when I was having starting issues. I had to jump start the truck and I must have overloaded the circuit I had sparks come out and melted the terminals on one of the batteries. Hope this saves someone a lot of time and money.