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Most commonly misfires on all cylinders is due to valves being out of adjustment on this engine, especially if more than 60K miles since they were last adjusted. You need to start with adjusting the valves on the engine to correct this. This is a very, very common cause
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Ok, I have uploaded the valve adjustment procedure for you as a pdf file attachment.
Well, I assumed you checked the fuel pressure before replace the fuel pressure regulator. But if you didnt, then you do need to check pressure as weak pressure can cause this. Pressure should be 40-48psi with vacuum line disconnected to the regulator with engine idling
No it doesnt. I have attached how to connect and test fuel pressure
If too low, then you will need to replace the fuel pump located in the fuel tank - it is accessed thru the trunk. Directions are attached. The fuel filter is part of the fuel pump assembly, so replace the whole assembly
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Ok, sounds good
Yes, as I stated in my original answer, valves out of adjustment is the most common cause of misfires on all cylinders.
Base engine timing could be off, the ecm could be faulty or a wiring issue. The odds of those are low. Again, the MOST common cause on this engine is valves being out of adjustment.