Quote: The last 2 runs the MSD box seemed to be cutting out over 4k RPM. The battery was draining and I didn't bring enough tools to check it out or fix it. Figured I'd pack it up and crawl home. I drove the car there and my headlights were dimming to almost nothing so I just drove with the parking lights on.
After you get your electrical system under conrol (I'd start with the ballest resistor, alternator, then the voltage regulator with a charging problem) check your fuel pump and fuel filter, it could have been from lack of spark with a weak battery but that sounds like it could also be starving of fuel at higher rpms under load.
