I went through a problem with those symptoms on my old 200 Ficht, turned out to be a low flowing injector. I sent all of them to DFI technologies to have them cleaned and checked and they confirmed that one was low flowing. One other symptom I had was that I could not check the timing while hooked up to the software because it would shut off when you would start the process. Everything worked correctly when I reinstalled them. A trained tech should be able to determine if one is bad by minipulating the fuel flow with the software.