During that time period Chrysler had extremely little trouble with their Engine Computers so that's the last thing to consider.
What led him to the crankshaft position sensor? Is he aware the air gap is critical? New sensors come with a thick paper spacer glued to the end or a thin plastic rib molded onto the end to set that gap. If a used sensor is installed, the remaining part of the rib must be cut off and a new paper spacer must be used.
There are a few different ways to approach this. Most mechanics have a scanner that can display live sensor data. Watch if it shows "no" or "present" for both the camshaft position sensor, (in the distributor), and the crankshaft position sensor, and if it shows they're "in sync". If the signal is missing for either sensor, the computer won't turn on the automatic shutdown relay which powers the coil(s), injectors, oxygen sensor heaters, alternator field, and the fuel pump or pump relay. You can also watch on the scanner to see if the ASD relay is listed as "on" or "high".
If you don't have a scanner, you can also monitor the dark green / orange wire going to the ignition coil, any injector, or either small wire on the back of the alternator. Proper operation is you'll see voltage there for only one second right after the ignition switch is turned on, then that voltage will come back during engine rotation, (cranking or running). You might hear the fuel pump for that first second too. Some digital voltmeters don't respond fast enough to show that one-second blip so a test light might work better. If the voltage doesn't come back during cranking, you have a sensor or timing belt / chain problem. The cam or crank sensor is the problem only about half of the time, so just popping in a new crank sensor without having a legitimate reason to do so is inserting another variable. A shorted sensor can kill the signals from both sensors, and they both have their power and ground wires in common. A corroded splice or a cut wire is as common as a defective sensor. The circuit should be tested before throwing random parts at the problem.
Wednesday, December 28th, 2011 AT 7:54 AM