[buzzinhalfdozen]

Yeah I've put at least 50 or more MSD ignition systems on cars, from basic 6al to the digital stuff and have never installed one of their filters. Though it's possible it may cure yours I'd bet if anything it may mask the real problem. I'll assume you've went back thru and verified all connections and lay out of wiring is correct? Main power and ground go to batt. positive and negative? Believe it or not if those 2 things aren't true you can have some real issues. I've seen some pretty cobbled up installs of MSD systems and for the most part they all worked, however as with most things when they add more "stuff" (digital systems) the proper installation is more critical. Make sure you've got all the wires ran correctly, not just the way they were with your old system. One last thought...where is your controller mounted at least in relation to the coil and high voltage lines?