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It is very common on ALL SATURN S series vehicle for ignition module failure. Usually the symptons are running rough and possibly a check engine light with misfire codes-P0300,P0301,P0302,P0303,P0304.
Some people have attampted replacing plugs and wires,even coils and continually have the problem reoccuring. What happens is the ignition module bolts(x4) stretch out through time and corrosion builds up underneath the module causing incorrect spark displacement. In turn this damages the plug wires and even at times the plugs. What needs to be done is replacing plug wires, plugs if needed, the ignition module bolts(saturn dealer item only)and the ignition module-NOT JUST THE COILS.
This should fix your problem.
the sensor that controls the mixture is the heated oxygen sensor (HO2S) in the exhaust manifold
compression is low as it should be no less that 125 psi that is if the readings were taken with the throttle wide open
the noise in the exhaust indicates unburnt mixture accumulating in the muffler to flash off
check for a crack in the flex section of the exhaust near the manifold
Try replacing a valve called the Idle Air Control Valve, if your car has one. See if that solves it. Not sure where it is located on your specific vehicle.
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