I have heard the horror stories from friends that made the switch to EFI. One friend even had to send the system back to the manufacturer. These friends are pretty technical and handy but couldn't get the car to run as good as it should. It sure is an expensive and time consuming venture and not the primrose path as it's advertised.
The thing that gets me is I have a 1995 jeep with obd1 and it has never given any problems other than I had to change the crank sensor at 300,000 miles.
Why can't an expensive aftermarket EFI system be made to be reliable and simple as an OEM system ?