Possible Causes & Corrections

Check the following items:

Search for bulletins.
Monitor the 24X crank sensor and CMP sensor signal present parameters on scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor "A" and CMP sensor circuits for intermittents. Monitor the 3X parameter on scan tool. If 3X is not responding, inspect CKP sensor "B" and circuits for intermittents. Inspect the Ignition Control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open or shorted, they may not set a DTC immediately, but are capable of causing driveability complaints. Test the CKP sensor "B" for an internal short. Refer to Electronic Ignition System Diagnosis in IGNITION SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 3.4L AZTEK & RENDEZVOUS article.
Inspect Mass Airflow (MAF) sensor conditions. See DIAGNOSTIC TROUBLE CODE DEFINITIONS in SELF-DIAGNOSTICS - 3.4L AZTEK & RENDEZVOUS article. Ensure that MAF sensor honeycomb is not damaged.
Test for low fuel pressure. Refer to Fuel System Diagnosis in FUEL SYSTEMS in BASIC DIAGNOSTIC PROCEDURES - 3.4L AZTEK & RENDEZVOUS article.
Test for contaminated fuel.
Ensure each injector harness is connected to the correct injector/cylinder.
Inspect for proper ignition voltage output.
If spark is not present at the coils, inspect for coil for cracks, carbon tracking/arcing, or a resistance value outside the specified range (5000-8000 ohms). Check spark plug wires for signs of arcing, crossfiring, cracks, carbon tracking, plug boot damage, pinched, improper routing, or a resistance value outside the specified range (3000 ohms per foot). Spraying secondary ignition wires with a light mist of water may help locate an intermittent problem. Ignition voltage will arc to ground when a secondary component is faulty. Check for defective ignition module, ignition system wiring, loose ignition module feed or ground connection or damaged system wiring.
Remove spark plugs and inspect for fouled plugs cracks wear improper gap, burned or damaged electrodes, improper heat range or reach. If spark plugs are gas or oil fouled, the cause of the fouling must be determined before replacing the spark plugs.
Test compression. Refer to MECHANICAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS in BASIC DIAGNOSTIC PROCEDURES - 3.4L AZTEK & RENDEZVOUS article. Low compression can be caused by sticking or leaking valves, worn camshaft lobes, valve timing, bent push rods, worn rocker arms, or broken valve springs. Check for excessive oil in combustion chamber, caused by leaking valve seals. Check for incorrect basic engine parts, such as camshaft, cylinder heads, pistons, etc.
Inspect intake and exhaust manifolds for casting flash.
Test Torque Converter Clutch (TCC) operation. Refer to appropriate DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.
Inspect exhaust system for possible restriction. Inspect exhaust system for damaged or collapsed pipes. Inspect mufflers for heat distress or possible internal failure. Inspect for possible plugged catalytic converter.