Well, the cam shaft sensor has been rplaced but the problems continue.

This happens in one of two situations: where the car has been soaking in the sun for several hours and/or I've been making lots of short city trips (runs of less than 10KM or 6MI)-- car will almost catch and then not start or fire; and where I've been driving with no problems and the engine dies and I coast to a stop.

Very unsafe to happen on the highway (only twice).

This seems to have been happening on hot humid days. The garage and other sources initially thought that the cam position sensor might have gone heat-mad and started giving false signals.

Well, a week ago, the sensor was replaced ($400CDN job) and I've had three dead engines in the last week (one non-start, two road-deaths).

Situation is the same: pop the hood, try about every minute or two until it fires up again (perfect start, no slow resurrection from the dead.)

My wife is not happy, I am not happy, and the problem still ahsn't been resolved.

I've had two suggestions that may work:
the fuel shutoff may be the culprit
resetting car's memory by pulling the battery cables

Anyone else have a possible solution?