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