Problem with a 318ci cutting out while running

run the fault codes and look for cam/crank position sensors.
faulty or loose connections may cause this fault. If you have more than 1 key in the ignition then it has been known that the mass of swinging keys will switch off the ignition
(current recall on all GMC ignition switches for just this reason)

Have you had the ignition switch replaced under recall yet??? Get this car to a dealer!!!

http://www.gmignitionupdate.com/product/public/us/en/GMIgnitionUpdate/index.html

Sounds like you have a fuel issue. It could be a fuel pump cutting in and out. It could be fuel pressure regulator, or an injector not spraying correct. I think it's time to find an honest educated repairman.

alternator, idle control valve, idle control valve tubes, intake manifold gaskets, fuel pressure regulator. replace all those & it will run like new

Hey, sounds like a vacum leak - common on those engines. when engine is on idle open boonet and lissten out for any whoosing noises near the rear of engine. There is a breather there that can be changed ( black round ) or check the pipes that connect to it coming from rocker cover for damage.

Is the engine oil level good?

try removing battery and cleaning all the ground under the battery tray and check main ground wire from battery to engine

is your engine cutting out while driving?? When it happens again notice if 1.Your speedometer goes to zero while in motion?? 2. If Some warning indicators lights aren't lit?? If yes, it's the ignition switch. Ignition switches on Hondas made from 97-02 encounter ignition switch failure. A recall was implimented in 2002. Ignition switch internal contacts severely arch or short causing intermitted power loss to vital engine electrical components. In this case causing the motor to intermittedly shut off while cruising. Call your local Honda dealer with your VIN# at hand for info on this. Possiblly they will replace this, if not they range from $45-$95....Hopefuly this tip helps

If no check engine codes, change your brake light sensor.

umh,have you checked the cambelt/chain tension its a bit strange for two sensors to go down at the same time !! cranksensor would make it stop but normally on sequential injection if the camsensor fails the car will keep running untilll you stop it then refuse to start....