livinginlilliput

Our 1995 LS400 has all the problems that were in the OP, and actually has had the stalling at 40 problem since we bought it. The previous owner did, too. Other than feeling like it was going to stall around 40 mph, the car has been a fantastic car and has not given us any problems. Until now. Two weeks ago the car stalled then totally died on a city street, after about 30 miles on the highway. We hadn't found this thread and replaced the spark plugs (original)and the coils. It was pulling codes for 300,302,303, 304, 305, 306... It ran great! Until yesterday. We were on our way to family for Thanksgiving (about 1 1/2 hours, about half highway) and about an hour into the trip I stopped at an intersection, and the car stalled crossing it. I managed to get it restarted and crossed the road, but then it stalled again, when I restarted it it only ran for a few more yards, and only at speeds between 10-20 mph. It was loping/surging. Could this be the ECM issue? Or do I need to find another solution? The car ended up being towed to Thansksgiving dinner and we had all sorts of friends looking at it last night, troubleshooting, and they couldn't find anything wrong. It wouldn't start last night. Then this morning it started right up. Does anyone have any ideas?