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Chris(aka-Moose)
Chris(aka-Moose), Nissan Technician
Category: Nissan
Satisfied Customers: 621
Experience:  16 years of experience
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Misfiring even after I replaced all 8 spark plugs. Codes

Customer Question

Misfiring even after I replaced all 8 spark plugs. Codes po300 & po308. I switched around the #8 & #4 but still the same code.
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: 148,000 miles
JA: What is the model/year of your Nissan?
Customer: 05 Nissan armada
JA: Are you fixing your Armada yourself? What have you tried so far?
Customer: ys, . I changed all the plugs and PCVs. Reset or tried to reset the ECU.
JA: Anything else you want the mechanic to know before I connect you?
Customer: losing power and its progressive
Submitted: 2 months ago.
Category: Nissan
Expert:  KALAMYKID replied 2 months ago.

The first thing you are going to have to do is run a compression test on all 8 cylinders. Make sure to write down the test results for each cylinder as I will need specific numbers for each to know what you will need to do next.