The crankshaft position sensor, ignition module, and/or powertrain control module (PCM) may fail resulting in illumination of the Check Engine Light with ignition system related fault codes stored in the PCM. Patience is necessary when dealing with this specific situation as normal diagnostic procedures are not effective. In many cases, the best option is to replace parts, one at a time until the fault is corrected.
Crankshaft Position Sensor, Ignition/Powertrain Control Module May Fail on Oldsmobile Intrigue
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1998 Oldsmobile Intrigue 140,000 mi, Visitor
Car started shaking badly, barely running. Found out one coil pack was not firing. swapped coil for another one, still cylinders 2 and four wouldn't fire. Changed module and fixed problem. Easy to do. All my problems were after the 140k mark.