I have the same issue, except my car is an 04 Comp G, Batterry Voltage drops between 11.5ish and 13.5ish when this pulsing is happening with the RPM drop and low voltage battery light "pings", but has never stalled on me. I do have a voltage booster on it (for warmer heated seats and faster defroster) but it has done it even with it not installed.