94 Buick LeSabre stalls

My 94 LeSabre sometimes stalls when normally driving , and sometimes when at a stop or trafic light. Other times it stalls right after it starts. However, it always starts again. Once in a while it stambles as if it is
going to stall. Otherwise it works OK. I don't know if it means anything, but, when it stalls in movement, I put the car in neutral and try to start it but it doesn't turn. I have to stop the car, shift to park and then it will turn and start. However, I think I remember being able to start the car in movement before just by shifting to neutral and turning the key. Recewntly, I have replaced the spark plugs and wires, crankshaft sensor (which didn't fix anything), EGR (which was bad), fuel pressure OK, no error codes present. Any ideas on what may cause the problem? I have noticed that at the junction between the exaust manifold and mufler, the gases escape. The springs are OK, so I think that the gasket is bad. If there is a leak in the mufler will it cause the problem above?
Thank you
Antonio
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I had similar symptoms a while ago in the 1995 model. It would also cut out sometimes on the highway, but since the transmission locks, it doesn't allow the engine to stop spinning, so you loose propulsion for a sec and then the light on the dashboard flashes on for a while as it would do if the car had been turned off and on.
For me, it turned out to be an intermittently flaky computer (ECM?) which isn't cheap to replace. Hope it's something else, but I see you've already gone through a huge list. You'll still want to try to replace the fuel filter if that hasn't been done in a while; could be clogged. After that you've exhausted pretty much everything and I'll bet you it would be the computer. You can replace it with a remanufactured one.
Well, I suppose there are some other possibilities: bad wiring.
Or, if the engine generally runs rough, perhaps some other sensors that control the fuel air mixture: MAF sensor, thermistor, O2 sensor?

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