Steve, shutting down every 8 miles, I would think that was a fuel supply problem.
Yeah, I thought that and about 40 other things.
It didn't shut down and die. It stopped firing for a tick, nose dived a little, and started running normally (if you can call it normally) again. I never had to pull off the HWY, and restart the car. 8 minutes is an approximation guess at the frequency. It was random and more frequent, since it happened about 40 times in 107 miles.
Not a fuel supply problem. More than likely it was something noise or poor connection related in the electrical system. Could have been in the car's electrical system, the ignition system, or the ECU itself. It definitely confused the hell out of the ECU, and the next day the motor would run and die idling, which is usually a loss of RPM signal.
I went through the entire electrical system, rerouted the main harness and had to re-flash the ECU and start over with the calibration to get the motor to run reasonably well the next day. I also tried different distributors, coils, plugs and so on and so forth while troubleshooting. I did get it to run again, but the system never worked as smoothly as it did before the incident during the cruise. It still hauled butt from a stand still. The Go Port's greatest strength for me was that it always took full throttle without a hiccup. Regardless, I had been looking for an excuse to take off the FiTech and try sequential firing MPFI designed by a mature company that had been working with EFI since 1979.
I'm running the same fuel system I was using with the Go Port with the Edelbrock Pro-Flo 4 and zero problems. The Edelbrock reads fuel pressure (which the FiTech does not do) and it matches the adjustable bypass fuel pressure regulator gauge exactly. Never a hiccup.
I'm not here trying to hurt the feelings of satisfied FiTech users. I'm just reporting an experience.