I have been having a problem with my em3-4f, I have had it for 2 years with no problems till now. What happens is it causes a huge studder with no acceleration. I used a o-scope to check the signal to the coil pack thinking it was an ignition miss or shut down.

My question is: Does the fuel cut function only shut fuel off?

Thanks,
Nelson

Yes, only cuts fuel below that throttle position. If your runing a map sensor then I would just turn fuel cut of below throttle position off. Also, check all of your grounds, as corrosion on grounding spots has always been a big problem with my set up. I live in a tropical island, and its gets really humid here.