Chrysler Repair: 95 LHS 3.5 wont stay running, exhaust gas recirculation valve, side exhaust manifold

Question
95 LHS 3.5 suddenly stoppped running. Sometimes it may start for a few seconds then stops. Have changed air filter, new Battery, wires & plugs. Based on fault code 54 changed camshaft sensor. Problem not solved. Any help you can give will be appreciated.

Answer
Hi Dianne,
I would keep checking for codes. You might also want to verify that the cam sensor was installed properly by measuring for pulsing between the signal wire (tan/yellow at the sensor or at pin 44 of the pcm) and the ground wire (black/light blue at the sensor or at pin 4 of the pcm) while you turn the engine by hand via the crank pulley bolt with the ignition switch in the 'run' position. It should pulse several times per revolution between 5 and 0.3V if the sensor is good.
Let's assume that the ignition system is o.k. and think about mixture. One possibility is that the temp sensor is not accurate but not so bad as to cause a code, and similarly with the manifold absolute pressure sensor, but you would need a voltmeter to access whether whether either of those could be true. So let us sit on those until we 'exhaust' the other possibility and you let me know if you have access to a volt-ohm meter.
I have another idea, one of my favorites when bad idle rears its ugly head.  I would take a look at the exhaust gas recirculation valve which is located behind the engine near the air intake throttle valve. It is mounted in a pipe that runs between passenger side exhaust manifold and the air intake manifold. The valve is mounted horizontally and has a valve stem between its round vacuum actuator top and the body of the valve attached to the pipe, inside the flange that connects the two parts. The stem has a slot into which you can insert the tip of a flat-bladed screwdriver so as to lever the stem back and forth against spring action which should move freely and close tightly. If the stem seems to be sticky so that stem doesn't close all the way by spring action, then you can try spraying some penetrating solvent like WD-40 on the valve stem to freeup its motion.
If the valve is sticking slightly ajar it will make for a rough idle and poor acceleration such as you describe because the mixture is too dilute. It is one of the most common causes of this symptom. So see if you can find the valve and check/lubricate the stem. To check it in motion you can rev the engine from idle to 2500 rpm and back to idle and watch to see if the valve stem moves freely in both directions to the extreme open and closed positions. It may be that the interior of the valve is cruddy so that might require that it be unbolted from the pipe where it it attached and cleaned. But chances are good it will only be a sticky stem. Feel free to write back with the results and other questions you might have.
Roland