Hi, I have a similar problem but not as bad. I also have a 93 eldorado that stalls. I don't have a northstar engine though and mine always starts back up (luckily). My stalling use to occur much more when I wasn't driving my car a lot but it seems that now i drive it everyday its helped A LOT. I've been driving it everyday for about 6 weeks and it has only stalled twice now i think. I dont know if you have this too but my engine sometimes seems to just about shut down on the highway, it doesn't stall out but the engine light comes on for a minute or 2 it won't accelerate like it should. But if you have found out more about your problem or have gotten it fixed could you please pass on the info. Thanks!