Well, I guess you guys aren't very active so I'll post what we found. Hope this helps someone now or in the future.
Driving the vehicle, we watched the data stream through a Snap-on Ethos. We saw that the ignition voltage ran lower as the vehicle heated up. When the ignition voltage dropped below 12.3v is when it would sputter.
We replaced the Alternator and on the subsequent drive we were able to stomp it and not lose an ounce of power. Apparently the lack of voltage was causing other systems to shut down. No battery light or anything that would indicate that, and it would be ok on the startup except for the "factory misfire" to warm up the catalytic system.
Driving the vehicle, we watched the data stream through a Snap-on Ethos. We saw that the ignition voltage ran lower as the vehicle heated up. When the ignition voltage dropped below 12.3v is when it would sputter.
We replaced the Alternator and on the subsequent drive we were able to stomp it and not lose an ounce of power. Apparently the lack of voltage was causing other systems to shut down. No battery light or anything that would indicate that, and it would be ok on the startup except for the "factory misfire" to warm up the catalytic system.
