90 300SE 110K mi stalls at idle after 5 min, then ok after 10

[jerryls]

The car starts and runs fine for about 5 minutes then stalls at every stop. After 15 minutes or when completely warmed up, it runs fine. The stalling out is frustrating and dangerous as I am usually just pulling into a busy highway at the stalling point.
Any suggestions on what it might be?

[eclass]

test the idle stop switch, make sure the overvoltage protection relay is good, what is the o2 sensor doing, fuel pressure, is it loosing spark? . lots of stuff that could cause this. unplug the EHA and see if it changes anything.

[jerryls]

Originally Posted by eclass

test the idle stop switch, make sure the overvoltage protection relay is good, what is the o2 sensor doing, fuel pressure, is it loosing spark? . lots of stuff that could cause this. unplug the EHA and see if it changes anything.

Thanks for the reply.
I know the spark is good, but I don't know about the other items. Where/what is the EHA. I have a cd manual that has schematics etc, but I can't look these things up as to where they are. Can you point me to where I can get better information.
I'm suspecting the fuel pump because when the car sits for a few days, it takes for ever to start. I changed the fuel filter and it didn't help.