130 amp alternator or not.....my guess (and I'm surprised noone else caught this - and, I've seen it happen before) is the problem is your underdrive pulleys. With the kickin' system you've got in that car, those pulleys aren't spinning that belt fast enough to keep that alternator juiced. I almost guarantee that this is your problem. Lose the pulleys.......or the stereo
------------------
'90 LX 5.0; 12K original miles (no sh*&); 3.55 gears; pulleys;Edelbrock Performer Heads; BBK shorties; MSD 6AL box w/ blaster 2 coil; Motorsport E303 cam; Pro-M 75mm MAF; BBK 70mm TB; Eibach spring kit; Southside welded subs; K&N cone filter charger; Hurst shifter; fiberglass turbo hood; A/C-less; rear seat-less; cat-less; 2 chamber Flos; Corbeau racing seats (fronts);
30# injectors; JMS Chip; 190 lb fp; TFS track heat Intake (12.299 @ 113)