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Maybe you're looking in the wrong area. You said it started to idle rough and kept shutting off. That could also be a fuel related issue. Possibly a clogged fuel filter or weak fuel pressure from the pump going bad. Check your fuel pressure. If you discover that the fuel pressure is correct, then make sure you have a strong blue colored spark from each coil by taking a good plug and plugging it into each coil while its out of the cylinder. Have someone spin it over and watch the color of the spark. A dull orange colored spark could mean bad coils or even the computer itself.
These cars are a bit sophisticated and only a guess can be offered without having some type of diagnostic equipment to read the code. If this happens when it is hot, but after it cools it restarts, chances are good it might be the CKP(crank position sensor). It is a common failure on these engines(M112 V6). It is best to have the code read and go from there.
Pretty sure the sensor is on the top of the gearbox bellhousing, and picks up its pulse from the flywheel on this model, its held in by allen bolts and is easiers to access from underneath the vehicle ( just above starter location
Open the air cleaner or intake hose and while someone is turning it over spray some ether into it with no more than three second bursts. If it cranks then you have a problem with fuel delivery and if it doesnt you are looking at something with the spark or ignition.