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The Catera has a history of stalling/cutoff issues. Many are solved with the replacement of the crankshaft position sensor. It does give the symptoms you describe. I would try that first as it is fairly cheap and easy to replace. If the problem persists after that, you've at least removed one potential possibility.
This is the description of the crank sensor from AUTOZONE (cost $44.99 USD)
The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
When not replaced, vehicle may experience no start, hard start, intermittent engine shut down, misfire, engine cut out, excessive fuel consumption, CEL illumination and/or failed emission test
Proper alignment, positioning and spacing for faster, easier installation
Designed to meet or exceed OE specifications in form, fit and function
Check to see if the cam position sensor or the crank position sensor is misaligned or has a corroded connector plug. The ECM needs to get a firing pulse from all cylinders. If the engine is a dual cam and is not attempting to start, some engines have a timing device (chain) for each bank. If the chain broke on one bank, the cam sensor can not possibly fire because the cam is not turning.
YOU NEED TO CHECK DARK GREEN/ORANGE WIRE AT IGNITION COIL WHEN CRANKING ENGINE FOR POWER..IF NO POWER,SHUTDOWN RELAY IS NOT BEING ENERGIZED..THIS ENGINE ALSO HAS CAMSHAFT POSITION SENSOR ON END OF CYLINDER HEAD..ENGINE CONTROLLER NEEDS CAM AND CRANK SIGNALS TO ENERGIZE THE SHUTDOWN RELAY..UNPLUG CRANK SENSOR AND CHECK VOLTAGE ON ORANGE WIRE..SHOULD HAVE APPROX 8V..IF NOT..UNPLUG CAM SENSOR AND SEE IF 8V SUPPLY RETURNS..IF NO POWER TRY UNPLUGGING VEHICLE SPEED SENSOR LOCATED IN TRANS HOUSING WHERE RIGHT SIDE AXLE COMES OUT OF TRANS..IF 8V RETURNS..THE SPEED SENSOR IS SHORTED INTERNALLY..THESE 3 SENSORS SHARE THE SAME 8V SUPPLY CIRCUIT..WITH SPEED SENSOR UNPLUGGED,PLUG CRANK SENSOR BACK IN AND TRY TO START ENGINE..HAVE SEEN THIS SAME PROBLEM AT WORK RECENTLY
check to make sure the ecm fuse is not blown,also check pin 16 on the plug where you plug in the scanner should be last pin on bottom row make sure this pin has power when the key is in the on position,hope this helps let me know
Check your fuses, also I'm nt sure if there is no spark at all or just not at the engine so I will suggest scecking to see if there is spark at the coil, if not check to see if the cil is getting power. if there is spark at the coil then check the lead wire. If no spark at coil but power to coil then it's time for a coil. Good luck and remember to rate all solutions you get, thanx.