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Why is My 2004 Kia Amanti Misfiring After Replacing the Spark Plugs?

Written by

Mia Bevacqua, ASE Certified Master Automobile Technician

Automotive Subject Matter Expert at CarParts.com

Updated on October 27th, 2023

Reading Time: < 1 minute

Q: I have a 2004 Kia Amanti with a 3.5L engine. I replaced the spark plugs, spark plug wires, intake manifold gasket, and ignition coils. Now, the car gives me misfire codes P0300 and codes P0301 through P0306. I checked for vacuum leaks and didn’t find anything. There were no codes before I did all of that work.

– Jesus Mena

A: Hi, Jesus. It sounds like something did not get installed properly while you were working on the car. My guess is that the issue is with the way the spark plug wires are installed. Start by double-checking all of your work, ensuring that the spark plug wires are routed correctly (going to the correct coil and cylinder), and fully seated. If the spark plug wires are not routed according to the vehicle’s firing order, the engine will misfire.

Good luck!

About The Author

Written By

Mia Bevacqua

Automotive Subject Matter Expert at CarParts.com

Mia Bevacqua has over 14 years of experience in the auto industry and holds a bachelor’s degree in Advanced Automotive Systems. Certifications include ASE Master Automobile Technician, Master Medium/Heavy Truck Technician, L1, L2, L3, and L4 Advanced Level Specialist. Mia loves fixer-upper oddballs, like her 1987 Cavalier Z-24 and 1998 Astro Van AWD.

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