PO300, PO303, PO305, Missfiring
 

Hello, I hope that there is someone out there that can help. I have a 1997 Millenia, it has a really bad missfire. The codes sometime indicate PO303, cyl #3. Sometimes the codes indicate PO305, cyl #5. And at times it simply indicates that it has a PO300, multiple cyl missfire. I have checked all the basics. I have replaced the distributor cap, rotor, Spark plugs and wires. I also tried a known good distributor, thinking that it might be bad. Then I changed the crankshaft positions sensor because the harness looked bad. The last thing I did was change the head gaskets. I'm hoping that I don't need to change the ECM. I dont know what else to check. Is there someone that knows how to get a hold of the service bullitens out there? I found out that there are three bullitens for this problem. They are: (TSB-0102702, NHTSA-10000388), (TSB-00298, NHTSA-603902), and (TSB-00298, NHTSA-603989).
Please help. Thank you for reading.

Tsb
 

Here is a link to a site where you might find the TSB you're looking for.
http://members.cox.net/sciberpunkt/tech/

I'm very interested! I would love to find out more inforamtion related to this topic. Thanks in advance.
me too, I need more detailed info

Well I finally found out what was wron with my car. It was the spark plug wires all along. Even though I had replaced them not long ago. I found out that the quality of those plug wires I purchased was poor. I now have new wires in and the car runs like a champ. Thanks to all that wrote.