Chrysler Repair: random misfire: 2.5L V-6, chrysler cirrus, battery clamps

Question
Hello Kevin,
    I'll get right down to business, I have a 97 Chrysler Cirrus 2.5l 6 cyl. car. The car was having issues when it was wet so i changed the distributor cap, rotor and wires. At first the wires ending up getting crosseed, so i had to take it apart and rewire the plugs.  My wifes dad was helping (he crossed the wires and gapped the spark plugs). So we started it after propperly wiring the plugs.  It ran good for the first day and then the second day started misfiring at red lights. The codes that are coming up are  :Ignition code #12 , #43
     scan tool code p0300
 Ihad to take off the computer and egr tube to get to the cap...new gaskets.

                                             Please help,

Answer
Hi Ken
The 0300 means that there are multiple misfires but unfortunately the possibilities of why are a very long list.
Looking at the 43 code, that one says there is an issue with the primary coil circuit of the spark coil in the distributor. The check for that would be to verify that the primary winding of the coil reads less than 2 ohms resistance (meaasure between pin 1 of the 2-wire plug socket and pin 6 of the 6-wire plug socket of the distributor), the voltage on pin 1 of the 2-wire plug at the distributor is 12V when the engine is running (use a fine pin to pierce through the insulation), that the connection from pin 4 of the pcm to pin 6 of the 6-wire plug at the distributor is continuous with no intermittency if you flex the wire.
The 12 code just means that the battery was disconnected sometime in the past 50-100 key cycles (if that is not the case then check the battery clamps).
The missing at idle after slowing down for a red light makes me wonder if you have an egr valve that is not closing tightly, which leans out the mixture and can cause missing.  Check the egr valve to make sure that its stem is closing via internal spring-action to a dead stop. It is located under the coolant filler tube, and it has a round vacuum operated top, a body of the valve mounted in the small exhaust pipe that splits off from the front exhaust manifold and a flange in between those two parts. Inside the flange is the valve stem which has a slot into which you can insert the tip of a screwdriver to move the stem back and forth. It should close to a dead stop by the internal spring action. If not then spray the stem with WD-40 where it enters the valve body and work it back and forth to free-up the action. It could be that the egr is the problem for the overall missing.
Roland
PS: I just found your question in the 'pool' to which it had been referred by Kevin. Please 'rate' may answer, and where you see the question about 'volunteer of the month' consider a 'yes' answer if this has proven helpful. Thanks