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I am trying to figure out what is wrong with my father's '01. It started misfiring so we pulled the codes and below is what we got: (we had the injectors all checked and they are all in perfect working condition) I have been looking through the service manuals with no luck yet.

Any thoughts on what direction I should take?

P0300 - The PCM has determined that multiple random misfires have occurred.

P0200 - The PCM has determined that a malfunction exists in the electrical circuit for the fuel injectors. - Definition: Fuel injector circuit condition. Explanation:The powertrain control module monitors for fuel injection circuit for opens, shorts & system overload conditions.
Probable causes:
1 - Open or shorted fuel injector
2 - Open or short in electrical circuit
3 - High fuel pressure - pressure regulator defective - fuel return line blocked
4- Check TPS and circuit for failure
 

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find out which cyl. and check the injector. any other codes ? ALWAYS check ignition first.then a complete fuel system check
 
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