Buick Repair Questions? Ask a Mechanic for Answers ASAP
Try disconnecting the mass airflow sensor connector at the intake manifold. Then attempt starting. Does the engine start easily and continue to run?
Remove one of the plug wires at the coils and crank the engine. Do you get spark from the coil while cranking?
Do you hear the fuel pump run when the key is turned on?
Will the engine run on starting fluid?
Pull a few spark plugs are they wet with fuel?
ECM failure is a possibility, but a remote one. We do not see many ECM failures. most common failures on this car that would cause stalling or a no start condition would be the crankshaft position sensor or the ignition control module.
Good to hear you got the problem solved. That is what I suspected in the beginning. That is why I had you unplug the sensor and run the engine. Normally when the sensor is bad the engine will run better with it unplugged.