Answer to: Engine stumbles on accelerationI had a stumble on my 2000 International with the N14 Celect Plus. It had a 6 pack of injectors put in approx 200k ago. The stumble started and in 2k miles went into full #6 injector fail. Now 3 weeks later, i am into a stumble again between 1200 and 1500 RPM, but then does take off. pointing to #3 injector. If unplugged at Idle it lags. If i unplug at 1400 RPM, it is changes nothing. so leads me to believe the injector is is failing. I did pull the injector, and test the pass through to be sure it was still good(known to fail as well). so i soaked the injector in cleaner, and then oil, and reinstalled. Seems like alot of BS, just to test. But what can you do? Well, it idled better, but still did the ol putt putt at 1300-1500 RPM. So, Injector is bad.