It starts easily at any temperature, even on a very cold Qu?bec
winter.

It runs smoothly, almost always...

Very seldom, it hiccups for a second or two while I drive at regular
speed; the phenomenon is so short that the car does not seem to loose
speed; the inertia restarts the engine.  Fortunately, it has never
occurred while I was overtaking another vehicle!

More frequently, but not very frequently, it stalls while I am stopped
at a red traffic light.  Then I have to use the starter for 10 to 20
seconds before the engine restarts.  The starter works flawlessly; I
changed 2 of its 4 brushes and I regreased last summer.

I read the Engine Control Module codes; I got two.

One is related to the Engine Coolant Temperature Sensor.  I am prone
to discount it because the problem occurs at any engine or ambient
temperature.

The other, OBD II P1355, is related to the Crankshaft Position Sensor
Reference.

Today, I disconnected the Crankshaft Position Sensor Reference and
Injector Sub-Harness.  This connector is almost on the top of the
timing chain cover, and the harness it connects to runs along the top
of the timing chain cover.  This connector was very clean inside.

I measured the Crankshaft Position Sensor Reference resistance at 540
ohms which is OK since it should lie between 470 and 570 ohms.  I also
checked that there is continuity between pin 7 and the engine.

I have yet to check that there is continuity between pin 3 and both
pins 44 and 48 on the Engine Control Module.  Is there a way to reach
this ECM connector without taking the whole dashboard apart?

As I see it, it is either the sensor itself or a intermittent in the
wiring.  I am afraid it will be difficult to find because the problem
occurs so infrequently.

I thank you very much in advance for any help.